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1Published 1976“...Geological Survey circular ;...”
Government Document Book -
2Published 1979“...Geological Survey circular ;...”
Government Document Book -
3Published 1990“...U.S. Geological Survey circular ;...”
Government Document Book -
4Published 1989“...U.S. Geological Survey circular ;...”
Government Document Book -
5Published 1990“...U.S. Geological Survey circular ;...”
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Government Document Book -
6by Blair-Tyler, Martha“...U.S. Geological Survey circular ;...”
Published 1994
Government Document Book