Material Types:

Image (499,363)Open Access Book (159,872)Primary Source (118,708)Public Domain Book (87,116)Map (21,198)Interactive Simulation (12,811)Audiobook (12,625)Video (8,401)Course Material (5,582)Course (4,832)Lesson Plan (4,357)Case (4,072)Textbook (3,320)Learning Object (2,369)Podcast (468)Casebook (257)Module (172)

Sources:

J. Paul Getty Museum (147,238)Library of Congress (118,735)Library of Congress - Images (111,258)Project Gutenberg (86,809)Oxford Text Archive (63,953)National Gallery of Art (52,342)Yale Center for British Art (50,278)Tate Modern (44,742)Art Institute of Chicago (42,080)Directory of Open Access Books (36,469)Los Angeles County Museum of Art (25,005)Library of Congress - Maps (21,198)Arabic Collections Online (14,688)OAPEN (13,801)Morgan Library and Museum (13,041)Librivox (12,625)Open Research Library (12,551)Wolfram Demonstrations (12,460)World Digital Library - Images (9,491)JSTOR Open Access Books (6,709)TED Talks (4,820)CTE ONLINE (4,357)H2O - Harvard University Law Cases (4,072)Project Muse Open Access Books (3,714)MIT OpenCourseWare (3,273)National Portrait Gallery (2,745)Phet - Activities (2,513)Open Knowledge Repository (2,503)Wisc-Online (2,369)TEDEd (2,276)World Digital Library - Books (2,195)FreeTechBooks (1,214)QUBES (1,142)CUNY Academic Works (884)Open Textbook Library (847)Dickinson College Commentaries - Images (772)iBiology (635)MetPublications (596)eCampus Ontario (582)BioInteractive (500)Teaching Commons - Textbooks (471)Library of Congress - Videos (441)University of Oxford Podcasts (388)Public Domain Review - Images (371)BC Campus (333)Public Domain Review - Books (307)LibreTexts - Courses (279)TU Delft OpenCourseWare (263)H2O - Harvard University Law Casebooks (257)University of Michigan Press (226)Getty Publications Virtual Library (220)Teaching Commons - Course Materials (196)LearnChemE (193)CORA - Community of Online Research Assignments (178)Achieving the Dream Courses (167)Phet - Interactive Simulations (158)MIT Press Open (157)Astronomy Education at UNL - Course Materials (151)Cornell Open (150)Public Domain Review - Films (140)John Hopkins Bloomberg School of Public Health (121)SUNY OER Catalog (116)Open Access Texts (115)LibreTexts (112)Noba (106)UCI Open (98)Saylor Academy (96)OPEN.ED @PSU (82)Open Course Library (81)Center for Computer-Assisted Legal Instruction - Podcasts (80)Penn State University Press (76)GALILEO Open Learning Materials (75)Open Michigan (72)NYU Press (71)Astronomy Education at UNL - Modules (66)Humanities Digital Library (66)American Institute of Mathematics (65)Center for Computer-Assisated Legal Instruction (63)ACLS Humanities E-Book (60)WayneOPEN (58)Purdue University Press (52)Washington University in St. Louis (51)UMass Boston OpenCourseWare (50)Brown University (50)OpenStax (50)Open Oregon (47)Northwestern Open (46)College of the Canyons (46)Whatcom Community College (42)E-International Relations (41)Open Yale Courses (40)Teaching Commons - Courses (40)Oregon State University (33)World Digital Library - Videos (32)Temple University Press (31)The Mind of the Universe: Open Source Science TV (30)Portland State University (29)Open SUNY Textbooks (26)Grand Valley State University (25)Ohio State University (25)Kwantlen Polytehnic University (23)Ryerson University (23)Boundless Courses (22)Syracuse Open (20)Rebus Community (19)University of North Dakota (19)LibreTexts - Course Materials (18)Granite State College (18)Oklahoma State University (18)Open Education Alberta (18)University of Kentucky (18)University of Saskatchewan (18)New Prairie Press - Kansas State University (17)Dickinson College Commentaries (16)Wesleyan University Press (16)University of Wisconsin - Madison (16)Penn State University (13)University of Texas at Arlington (13)Smarthistory (12)University of South Florida (12)University of Washington (12)Cleveland State University (11)Indiana University (10)TU Delft (10)Stanford Engineering Everywhere (9)Amherst College Press (9)Boise State University (9)University of Hawaii (9)University of Minnesota (9)Plymouth State University (8)University of Central Florida (8)College of DuPage (7)York University (7)Gettysburg College (6)University of Houston (6)Muhlenberg College (5)University of Arkansas (5)University of Massachusetts Amherst (5)Iowa State University (4)Pacific University Press (4)Trinity University (4)University of California, Berkeley (4)University of Southern Queensland (4)Virginia Commonwealth University (4)George Fox University (3)Michigan State University (2)Salt Lake Community College (2)Eastern Kentucky University (1)Ferris State University (1)Keene State University (1)Virginia Western Community College (1)Washington State University (1)

Subjects:

Law (5,761)Religion (5,034)History (4,768)Literature (4,180)Physics (1,539)Mathematics (968)Political (959)Sociology (897)Art and Art History (849)Medical and Health Sciences (845)Education (792)Social Sciences (756)Science & Technology (732)Language (714)Chemistry (680)Science, Technology, Engineering & Mathematics (534)Political Science (469)Biology (462)Philosophy (442)Psychology (424)Anthropology (381)Economics (379)Business (357)Electronics (321)Languages and Linguistics (310)Social Studies (295)Electrical Engineering and Computer Science (258)Astronomy (252)Management (248)Chemical Engineering (243)Health (222)Library and Information Science (215)Industrial Automation (211)Architecture (206)Technology (206)Manufacturing (193)Urban Studies and Planning (193)Design, Engineering & Technology (169)Science (155)Mechanical Engineering (154)Comparative Media Studies/Writing (147)Business, (126)General Works (114)Earth Sciences (108)Biochemistry (108)Civil and Environmental Engineering (108)Earth, Atmospheric, and Planetary Sciences (107)Art (99)Archaeology (98)Anatomy and Physiology (97)Computer Science (95)Brain and Cognitive Sciences (94)Geography. Anthropology. Recreation (89)Aeronautics and Astronautics (88)Machine Tool (87)Thinking & Learning (84)Earth and Mineral Sciences (82)Music (80)Ecology (74)Film and Media Studies (74)Music and Theater Arts (71)Communication (70)Engineering Systems (67)Engineering (66)International Relations (66)Science, Technology, and Society (66)Film (66)Agriculture (65)Linguistics (61)Materials Science and Engineering (60)Women's and Gender Studies (59)Information Technology (58)Evolution (58)Public (56)Humanities (51)Nuclear Science and Engineering (49)Media Arts and Sciences (48)Policy Studies (46)IT Networking (45)Fine Arts (44)Animal Sciences (43)Languages (43)Other (42)Physical Sciences (42)Finance (42)Multidisciplinary (40)Population (35)Geography (34)Music and Books on Music (34)Welding (34)Science, Technology, and Mathematics (33)Labor Studies (32)Computer Programming (32)Communication studies (31)English (30)General (30)Experimental Study Group (30)Creative Writing (29)Politics (29)Fiction (28)Theater and Performance Studies (28)Poetry (28)Ancient and Classical (26)Web Development (26)Edgerton Center (26)Cultural Studies (25)Information (24)Women's Studies (24)Environmental Science (24)People (24)Law, Public Safety, Corrections & Security (23)Feminist (23)IT Security (22)Jewish Studies (22)Transportation (22)Transportation, Distribution & Logistics (21)Ghosts & Occult (21)Environmental (20)Performing (20)Media Studies and Communications (20)Criminology (19)Data, Systems, and Society (19)International (19)Misc. (18)Gender (17)Student Success (17)Classical Studies (16)Labor (16)Space & The Future (15)Biological (15)Demography (15)Democracy and Human Rights (14)Career Skills (14)Travel & Exploration (14)Political Theory (14)Library (14)Film, Theater, and Performing Arts (14)Race and Ethnicity (12)Writing & editing guides (12)Environmental, Earth, and Ocean Sciences (12)Geosciences (12)Design & Typography (12)Natural Sciences (12)Rhetoric, Composition, and Writing (12)IT Database (11)Wisdom (11)Urban Sociology (11)Dance (10)Workforce (10)Customs & Culture (10)Humour & Satire (10)Natural World (10)Novelty (10)Development (10)Peace (10)Number Systems (9)Death (9)Folklore (9)African American and African Diaspora Studies (9)Communications (8)Geology (8)IT Support (8)American Studies (8)Stories (8)Cultural (8)Pragmatism (8)Accounting (7)Human Services (7)Trigonometry (7)Social Ecology (7)The 'Other' (7)Bibliography (7)Museum Studies (7)Liberal Studies (7)Gender Studies (6)Military Science (6)Public Health Resources (6)Foundational IT Skills (6)Marketing (6)Science Practices (6)Comparative Politics (6)Gender & Women’s Studies (6)Public Health (6)Translation Studies (6)Drama (5)Social work (5)Concourse (5)Sport (5)Computer (5)Latin American and Caribbean Studies (5)Urban (5)Area and Ethnic Studies (4)LGBT Studies (4)Nursing Resources (4)Public Policy Resources (4)Interpersonal communication & skills (4)Microeconomics (4)Theatre studies (4)Veterinary Medicine (4)Crime (4)Love (4)Strange Phenomena (4)Literary Studies (4)Botany (4)Landscape Architecture (4)Deaf and Disability Studies (4)Native American and Indigenous Studies (4)Statistics (4)Medieval and Renaissance Studies (4)Media Studies (4)Social (4)ES (3)Arts, Audio/Video Technology & Communications (3)African American Studies (3)Electrical engineering (3)Environmental Studies (3)Politics & government (3)Research methods: general (3)Fashion (3)Sex (3)Zoology (3)Garden (3)Methodology (3)Photography (3)Social Aspects (3)Korea (3)Web programming (3)Publishing & book trade (3)Naval Science (2)Sociology of Religion (2)Nursing (2)Study & learning skills: general (2)Israeli Studies, Jewish Studies (2)Usage & grammar guides (2)Web graphics & design (2)Computational biology / bioinformatics (2)Critical and Creative Thinking (2)Physics: Fluid mechanics (2)Landscapes (2)Maps (2)Military (2)Latin (2)Canadian Studies (2)American (2)Ancient Studies and Classics (2)Local and Regional (2)Aquatic (2)Middle Eastern Studies (2)Paleontology (2)German Studies (2)Children's Studies (2)Book History and Print Culture (2)Design (2)Gender studies: women & girls (2)Public health & preventive medicine (2)Public finance accounting (2)Physics Resources (1)Medicine & Nursing (1)Tema principal Guías gramaticales y de uso (1)Careers guidance (1)Co (1)College Success (1)Engineering graphics & draughting / technical drawing (1)Forests & woodland (1)GE (1)Information retrieval & access (1)Literacy (1)Metals technology / metallurgy (1)Microsoft programming (1)Nursing specialties (1)Oceanography (1)Other manufacturing technologies (1)Public relations (1)Security, safety & protection skills / professions (1)Spreadsheet software (1)Cultural Studies, Detroit (1)Earthquake engineering (1)Folklore, Israeli Studies, Jewish Studies (1)Folklore, Jewish Studies (1)Folklore, Maritime Studies (1)Government & Public Administration (1)Great Lakes, Maritime Studies (1)Great Lakes, Maritime Studies, Michigan (1)Hospitality & Tourism (1)Hydraulics / Pneumatics (1)International law, transport & commerce: maritime law (1)Israeli Studies, Music (1)Literary studies: plays & playwrights (1)Michigan, Upper Peninsula (1)Translation & interpretation (1)Gay & Lesbian studies / LGBTQ studies (1)Law: wills, probate, succession (1)Classics (1)Critical Reading and Writing (1)First Year and Intermediate Seminar (1)Geology and Geophysics (1)Graphical & digital media applications (1)Labs & Demos (1)Performing Arts (1)Public Policy (1)Regional, state & other local government (1)Systems analysis & design (1)Electric motors (1)Legal aspects of criminology (1)Drugs (1)Emotion and Expression (1)Food (1)Plays, playscripts (1)Work (1)Rural Sociology (1)Biographies and Memoirs (1)Statistics, (1)Native American Literature (1)French Studies (1)Children's Literature (1)Asian and Pacific Studies (1)Publishing (1)African (1)Astronomy, (1)Gerontology (1)Journalism (1)Bioethics (1)Food Studies (1)Archeology (1)Gender & Sexuality Studies (1)Information theory (1)Science: general issues (1)Insects (entomology) (1)User interface design & usability (1)Engineering: general (1)Peace studies & conflict resolution (1)Engineering thermodynamics (1)Human trafficking (1)Forestry industry (1)Cultural & media studies (1)Media studies: journalism (1)Tema principal Literatura comparada (1)Regional studies (1)Secretarial, clerical & office skills (1)Computer security (1)News media & journalism (1)Soil science & management (1)Building construction & materials (1)Production & industrial engineering (1)Management decision making (1)Film and TV (1)Primary Subject (1)General cookery & recipes (1)Performance art (1)Urban Studies (1)Films, cinema (1)Climate change (1)Social geography (1)Freedom of information law (1)Management: leadership & motivation (1)Information Management (1)Sales & marketing (1)Primary Subject Psychology (1)Media, entertainment, information & communication industries (1)Ancient, classical & medieval texts (1)Speculative fiction (1)Commercial law (1)Desktop publishing (1)

Usage Rights:

Public Domain (616,522)Attribution-NonCommercial-NoDerivs (73,604)Attribution-ShareAlike (66,127)Open Access (52,342)Attribution-NonCommercial-ShareAlike (29,632)Attribution (12,534)Attribution-NonCommercial (6,055)CC0 (2,745)Attribution-NoDerivs (867)ANU Press (568)All Rights Reserved (21)University of Adelaide Press (21)Attribution-ShareAlike (16)Firenze University Press (12)Free Documentation License (GNU) (11)No Rights Reserved (3)Atribución NoComercial CompartirIgual (1)Atribución (1)

Languages:

English (22,478)Arabic (14,700)German (9,753)French (7,573)Portuguese (2,253)Spanish (2,052)Italian (974)Dutch (769)Norwegian (140)Russian (101)Finnish (84)Danish (63)Catalan (52)Swedish (39)Lithuanian (23)Slovenian (20)Latin (16)Afrikaans (15)Chinese (12)Czech (12)Greek (10)Polish (8)Bulgarian (7)Turkish (7)Albanian (6)Welsh (4)Tamil (4)Croatian (4)Hindi (4)Japanese (3)Ancient Greek (3)Slovak (2)Kinyarwanda (2)En (2)Hebrew (1)Ladino (1)Ukrainian (1)Chechen (1)

945,523 results found

Open Access Book
Open Access Book image
Transport- und Umsatzprozesse bei der Abwasserversickerung aus undichten Kanälen
Author: Hua, Jianmin
Source: Directory of Open Access Books
Usage Rights:
Publication Date: 2007
View Open Access Book
Share
Open Access Book
Open Access Book image
Transatlantic Democracy in the Twentieth Century. Transfer and Transformation
Author: Nolte, Paul
Source: Directory of Open Access Books
Publication Date: 2016
View Open Access Book
Share
Open Access Book
Open Access Book image
Les transcriptions juridiques du principe pollueur-payeur
Author: Elzéar de Sabran-Pontevès
Source: Directory of Open Access Books
Publication Date: 2007
View Open Access Book
Share
Open Access Book
Open Access Book image
Transcriptional Regulation: Molecules, Involved Mechanisms and Misregulation
Author: Ciccodicola, Alfredo, Casamassimi, Amelia
Source: Directory of Open Access Books
Usage Rights:
Publication Date: 2019
View Open Access Book
Share
Open Access Book
Open Access Book image
Transmucosal Absorption Enhancers in the Drug Delivery Field
Author: Maher, Sam, Illum, Lisbeth, Casettari, Luca
Source: Directory of Open Access Books
Usage Rights:
Publication Date: 2020
View Open Access Book
Share
Open Access Book
Open Access Book image
Transport of Fluids in Nanoporous Materials
Author: Suresh K. Bhatia (Ed.), Guozhao Ji (Ed.), Xuechao Gao (Ed.), David Nicholson (Ed.)
Source: Directory of Open Access Books
Usage Rights:
Publication Date: 2019
View Open Access Book
Share
Open Access Book
Open Access Book image
Transnational literate lives in digital times
Author: Gail E Hawisher, Cynthia L. Selfe, Patrick W Berry
Source: Directory of Open Access Books
View Open Access Book
Share
Open Access Book
Open Access Book image
Translating Chinese Tradition and Teaching Tangut Culture
Author: Galambos, Imre
Source: Directory of Open Access Books
Usage Rights:
Publication Date: 2015
View Open Access Book
Share
Open Access Book
Open Access Book image
Transformation von Multiphysics-Modellen in einen FPGA-Entwurf für den echtzeitfähigen HiL-Test eingebetteter Systeme
Author: Köllner, Christian
Source: Directory of Open Access Books
Usage Rights:
Publication Date: 2013
View Open Access Book
Share
Open Access Book
Open Access Book image
Transcending Borders
Author: Ikuko Sagiyama, Valentina Pedone
Source: Directory of Open Access Books
Usage Rights:
Publication Date: 2016
View Open Access Book
Share
Open Access Book
Open Access Book image
Transparências: linguagem e reflexão de Cícero a Pessoa
Author: Diogo Ferrer
Source: Directory of Open Access Books
Usage Rights:
Publication Date: 2018
View Open Access Book
Share
Open Access Book
Open Access Book image
Trauma, Memory and Religion
Author: Natalie Fritz, Hessel Jan Zondag, Daria Pezzoli-Olgiati, Stefanie Knauss, Vaughan S Roberts, Verena Marie Eberhardt, Lucien M. van Liere, Gerwin van der Pol, Jacob Given, Freek L. Bakker
Source: Directory of Open Access Books
Usage Rights:
Publication Date: 2018
View Open Access Book
Share
Open Access Book
Open Access Book image
Trith-Saint-Léger : du premier âge industriel
Author: Odette Hardy-Hémery
Source: Directory of Open Access Books
Publication Date: 2002
View Open Access Book
Share
Open Access Book
Open Access Book image
Trends in Comparative Endocrinology and Neurobiology
Author: Hubert Vaudry, Olivier Kah
Source: Directory of Open Access Books
Usage Rights:
Publication Date: 2018
View Open Access Book
Share
Open Access Book
Open Access Book image
Três ensaios de bioética
Author: Fermin Roland Schramm
Source: Directory of Open Access Books
Usage Rights:
Publication Date: 2015
View Open Access Book
Share
Open Access Book
Open Access Book image
Tributo a Vênus: a luta contra a sífilis no Brasil, da passagem do século aos anos 40
Author: Carrara, Sérgio
Source: Directory of Open Access Books
Usage Rights:
Publication Date: 1996
View Open Access Book
Share
Open Access Book
Open Access Book image
Trends in Microextraction Techniques for Sample Preparation
Author: Victoria F. Samanidou (Ed.)
Source: Directory of Open Access Books
Usage Rights:
Publication Date: 2018
View Open Access Book
Share
Open Access Book
Open Access Book image
Tríptico de la expulsión de los moriscos
Author: Rafael Benítez Sánchez-Blanco (dir.)
Source: Directory of Open Access Books
Publication Date: 2012
View Open Access Book
Share
Open Access Book
Open Access Book image
Trends in Microextraction Techniques for Sample Preparation
Author: Victoria F. Samanidou (Ed.)
Source: Directory of Open Access Books
Usage Rights:
Publication Date: 2018
View Open Access Book
Share
Open Access Book
Open Access Book image
Travaux de Diachronie 2
Author: Jean-Paul Regis
Source: Directory of Open Access Books
Publication Date: 2001
View Open Access Book
Share
Open Access Book
Open Access Book image
Trauma; Psychosis and Posttraumatic Stress Disorder
Author: Kate V. Hardy, Kim T. Mueser
Source: Directory of Open Access Books
Usage Rights:
Publication Date: 2017
View Open Access Book
Share
Open Access Book
Open Access Book image
Traumatic Brain Injury as a Systems Neuroscience Problem
Author: Isaac Chen, John F. Burke, Akiva S. Cohen
Source: Directory of Open Access Books
Usage Rights:
Publication Date: 2017
View Open Access Book
Share
Open Access Book
Open Access Book image
Les travailleurs de l’innovation : De l’entrepreneur aux salariés
Author: Pierre Boisard, Claude Didry, Dima Younès
Source: Directory of Open Access Books
Publication Date: 2016
View Open Access Book
Share
Open Access Book
Open Access Book image
Trois Paroisses de Rouen, xiiie-xve siècle : Saint-Lô, Notre-Dame-la-Ronde et Saint-Herbland. Étude de topographie et d'urbanisme
Author: Philippe Cailleux
Source: Directory of Open Access Books
Publication Date: 2011
View Open Access Book
Share
Open Access Book
Open Access Book image
Trasformazioni geometriche e figure dell'architettura
Author: Stefania Iurilli
Source: Directory of Open Access Books
Usage Rights:
Publication Date: 2014
View Open Access Book
Share
Start of page image
pages image 3408
pages image 3409
pages image 3410
pages image 3411
pages image 3412
selected page page image 3413
pages image 3414
pages image 3415
pages image 3416
pages image 3417
End of page image