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1

by Plummer, F. B. (Frederick Byron), 1886-1947
Austin, Tex. : The University, 1931

Book

2

by Monroe, Watson Hiner, 1907-1992
[Washington, D.C.] : United States Geological Survey, 1946

Book

3

by Imlay, Ralph W. (Ralph Willard), 1908-1989
[Washington, D.C.] : U.S. Geological Survey, 1951

Book

4

by Monroe, Watson Hiner, 1907-1992
[Washington, D.C.] : United States Geological Survey, 1946

Map

5

by Imlay, Ralph W. (Ralph Willard), 1908-1989
[Washington, D.C.] : U.S. Geological Survey, 1951

Map

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