Making a world of difference : recent USGS contributions to the nation / U.S. Dept. of the Interior, U.S. Geological Survey.
[Reston, Va.?] : U.S. Dept. of the Interior, U.S. Geological Survey, 1998.
Geological Survey (U.S.)
Research > United States.
32 p. :
ill. (chiefly col.), col. maps ;
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