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81
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83
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84by Page, R. W.“...U.S. Dept. of the Interior, Geological Survey,...”
Published 1980
Government Document Book -
85by Still, Patsy J.“...U.S. Dept. of the Interior, Geological Survey,...”
Published 1980
Government Document Book -
86Published 1980“...U.S. Dept. of the Interior, Geological Survey,...”
Government Document Book -
87by Parker, Gene W.“...U.S. Dept. of the Interior, Geological Survey,...”
Published 1980
Government Document Book -
88by Bednar, Gene A.“...U.S. Dept. of the Interior, Geological Survey,...”
Published 1980
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89by Mallory, Michael J.“...U.S. Dept. of the Interior, Geological Survey,...”
Published 1980
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90by Slack, Larry J.“...U.S. Dept. of the Interior, Geological Survey,...”
Published 1980
Government Document Book -
91by Hamilton, Thomas D. (Thomas Dudley), 1936-“...Dept. of the Interior, U.S. Geological Survey,...”
Published 1980
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92by Adam, David P.“...U.S. Dept. of the Interior, Geological Survey,...”
Published 1980
Government Document Book -
93by Renn, Danny E.“...U.S. Dept. of the Interior, Geological Survey,...”
Published 1980
Government Document Book -
94Published 1980“...U.S. Dept. of the Interior, Geological Survey,...”
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95by Moss, Marshall E.“...U.S. Dept. of the Interior, Geological Survey,...”
Published 1980
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96Published 1980“...U.S. Dept. of the Interior, Geological Survey,...”
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97by Abel, John F.“...U.S. Dept. of the Interior, Geological Survey,...”
Published 1980
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98by Rosholt, John Nicholas, 1923-“...U.S. Dept. of the Interior, Geological Survey,...”
Published 1980
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99by Zartman, Robert E.“...U.S. Dept. of the Interior, Geological Survey,...”
Published 1980
Government Document Book -
100by Taggart, Joseph E.“...U.S. Dept. of the Interior, Geological Survey,...”
Published 1980
Government Document Book