Author: Robertson, Ralph D. (Ralph Denny) - Fortier, Samuel - Harding, Sidney T. - Robertson, Ralph D. - United States. Office of Experiment Stations Source:Library of Congress Usage Rights: Publication Date: 1913 View Primary Source
Author: Swigart, Charles H. - United States. Department of the Interior - Holt, Lester M. - United States. Office of Indian Affairs - United States. Bureau of Reclamation - Carr, Don M. Source:Library of Congress Usage Rights: Publication Date: 1913 View Primary Source
Author: Washington (State). Special Investigating Commission on Highway Department - Washington (State). Board of Control - Gillette, Halbert Powers - Cagwin, A. E. Source:Library of Congress Usage Rights: Publication Date: 1910 View Primary Source
Author: United States. Congress. House. Committee on Mines and Mining - United States. Congress House Source:Library of Congress Usage Rights: Publication Date: 1909 View Primary Source
Author: Illinois. University. Department of Mining, Metallurgical and Petroleum Engineering Source:Library of Congress Usage Rights: Publication Date: 1913 View Primary Source