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1“...Geological Survey bulletin ;...”
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2“...Geological Survey bulletin ;...”
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3
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4Published 1988“...U.S. Geological Survey bulletin ;...”
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5by Pearson, Robert Carl, 1926-“...U.S. Geological Survey bulletin ;...”
Published 1988
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6by Pearson, Robert Carl, 1926-“...Geological Survey bulletin ;...”
Published 1980
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7by Christman, Robert A. (Robert Adam), 1924-, Brock, M. R. (Maurice Rex), 1922-, Pearson, Robert Carl, 1926-, Singewald, Q. D. (Quentin Dreyer), 1902-1987“...Geological Survey bulletin ;...”
Published 1959
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9
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10by Pearson, Robert Carl, 1926-, Fillo, Paul V., Hayes, Philip T. (Philip Thayer), 1923-“...Geological Survey bulletin ;...”
Published 1967
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11by Pearson, Robert Carl, 1926-, Kiilsgaard, Thor H., Patten, Lowell L., Mattick, Robert E.“...Geological Survey bulletin ;...”
Published 1971
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12Published 1987“...U.S. Geological Survey bulletin ;...”
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13by Pearson, Robert Carl, 1926-“...U.S. Geological Survey bulletin ;...”
Published 1996
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14by Pearson, Robert Carl, 1926-“...U.S. Geological Survey bulletin ;...”
Published 1996
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15by Pearson, Robert Carl, 1926-“...U.S. Geological Survey bulletin ;...”
Published 1987
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