Author
Geological Survey (U.S.)
19
Weld, Betsy A.
19
Brett, George W.
8
Johnson, Arthur
8
Asselstine, Erwin S.
6
Griffin, Margaret S.
5
Iseri, Kathleen T.
4
Geological Survey (U.S.),
3
Earth Science Information Center (U.S.)
2
Atherton, Ruth A.,
1
Brett, George W.,
1
Eckstein, Wenonah H.,
1
Ehrenberg, Ralph E., 1937-
1
Eisenlohr, William S. Jr., 1907-1997
1
Griffin, Margaret S.,
1
Horton, Gary W.
1
Library of Congress. Geography and Map Division
1
Millgate, M. L.
1
National Archives (U.S.)
1
National Cartographic Information Center
1
Randall, Lois E. 1902-
1
Spratt, R. E.,
1
United States. Bureau of the Census
1
Weld, Betsy A.,
1
Wilmoth, Benton M., 1925-
1
Winch, Kenneth L.
1