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1by Helz, Rosalind Tuthill“...U.S. Dept. of the Interior, Geological Survey,...”
Published 1983
Government Document Book -
2by Mangan, Margaret T.“...U.S. Dept. of the Interior, Geological Survey :...”
Published 1986
Government Document Microform Book -
3by Helz, Rosalind Tuthill“...U.S. Dept. of the Interior, Geological Survey ;...”
Published 1993
Government Document Microform Book -
4Published 1995“...U.S. Dept. of the Interior, Geological Survey,...”
Government Document Microform Book -
5by Helz, Rosalind Tuthill“...U.S. Dept. of the Interior, U.S. Geological Survey,...”
Published 2012
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