Geological survey research 1970.
Series: U.S. Geological Survey professional paper -- 700-A, B, C, D
Publisher: U.S. Government Printing Office
Published: 1970
Place of publication: Washington, DC
Language: eng
Subjects: Geology -- United States -- Periodicals.
Genres: Periodicals.
Notes: Began with 1960.

Bibliogr.

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