K - Law 31 F - General American History 22 Q - Science 22 T - Technology 17 H - Social Science 16 G - Geography, Anthropology, Recreation 9 S - Agriculture 8 E - United States History 7 R - Medicine 4 A - General Works 3 C - Historical Sciences 3 P - Language and Literature 3 Z - Library Science 3 D - World History 1 N - Fine Arts 1 U - Military Science 1 ver todos ...

Geological Survey (U.S.) 41 United States Federal Emergency Management Agency 37 Eastern Municipal Water District (Riverside County, Calif.) 14 California Agricultural Experiment Station 12 United States Congress. House. Committee on Natural Resources 12 United States Soil Conservation Service 11 Harley, R. Bruce 9 United States Bureau of Land Management 9 United States Bureau of Reclamation 9 California Department of Health Services 8 United States Congress. House. Committee on Resources 8 Knecht, Arnold A 7 United States Bureau of Indian Affairs 7 California Department of Health Services. Toxic Substances Control Division 6 Hogan, Pamela K 6 Orange County Water District (Calif.) 6 United States Administration on Aging 6 Volunteer Center of Greater Riverside (Calif.) 6 Wilson, Ofelia Caballero 6 California Department of Parks and Recreation 5 California Geological Survey 5 Dixon, Lloyd S 5 Kaehler, C. A 5 Powell, Robert E 5 Rand Corporation 5 San Bernardino Valley Municipal Water District (Calif.) 5 United States Army. Corps of Engineers. Los Angeles District 5 United States Bureau of Land Management. California Desert District 5 Adrian, Betty M 4 Burton, Carmen A 4 ver todos ...

English 368

History 24 Maps 13 Legislative materials 7 Pictorial works 5 Promotional materials 5 Biography 4 Local history 4 Statistics 4 Environmental impact statements 3 Illustrated works 3 Academic theses 2 Biographies 2 Electronic books 2 Guidebooks 2 Handbooks, manuals, etc 2 Technical reports 2 Academic Dissertation 1 By-laws 1 Cartes 1 Case studies 1 Conference papers and proceedings 1 Databases 1 Designs and plans 1 Directories 1 Fliers (Ephemera) 1 Genealogy 1 Government publications 1 Handbooks and manuals 1 Literary collections 1 Literature 1 ver todos ...

1850-1916 2 1861-1947 2 Miocene 2 To 1846 2 1700-1899 1 1735-1788 1 1796-1860 1 1843-1924 1 1857-1930 1 1869-1935 1 1878-1949 1 1885-1945 1 18th century 1 19th century 1 2000-2099 1 21st century 1 From 10 thousand to 10 million years ago 1 From 10 to 25 million years ago 1 From 55 to 65 million years ago 1 Paleocene 1 Paleozoic 1 Pleistocene 1 Pliocene 1 ver todos ...