Author
Geological Survey (U.S.)
77
United States. Central Intelligence Agency
11
Hassan, A. F.
3
Facts on File, Inc
1
Gannett, Henry, 1846-1914
1
Kuchinski, John G.
1
Martin Greenwald Associates
1
Milewski, Virginia M.
1
Missouri. Division of Geological Survey and Water Resources
1
Missouri. Geological Survey
1
Pennsylvania. Bureau of Topographic and Geologic Survey
1
U.S. Coast and Geodetic Survey
1
United States. Bureau of the Census
1
United States. Soil Conservation Service
1