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4Principal facts for gravity stations in parts of Grand, Clear Creek, and Summit Counties, Colorado /Published 1982Government Document Book
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6by Izett, Glen Arthur, 1928-, Cobban, William A., 1916-2015, Gill, James R. (James Rogers), 1922-1972
Published 1971Government Document Book -
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9Published 1995Government Document Map
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10Published 1995Government Document Map
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11Published 1988Government Document Map
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12Published 1991Government Document Map
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13Published 1991Government Document Map
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