1
University of Arizona, Tucson, AZ, United States
Published in 1920
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monograph online
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2
Pennsylvania Geological Survey, Harrisburg, PA, United States
Published in 1939
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technical report online
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3
U. S. Geological Survey, Reston, VA, United States
Published in 2009
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4
University of Arizona, Tucson, AZ, United States
Published in 1926
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5
University of Arizona, Tucson, AZ, United States
Published in 1936
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6
University of Arizona, Tucson, AZ, United States
Published in 1942
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7
University of Arizona, Tucson, AZ, United States
Published in 1948
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8
U. S. Geological Survey, Reston, VA, United States
Published in 2013
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9
U. S. Geological Survey, Reston, VA, United States
Published in 2005
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10
University of Arizona, Tucson, AZ, United States
Published in 1930
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11
University of Arizona, Tucson, AZ, United States
Published in 1934
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12
University of Arizona, Tucson, AZ, United States
Published in 1951
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13
University of Arizona, Tucson, AZ, United States
Published in 1953
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14
Minnesota Geological Survey, St. Paul, MN, United States
Published in 1991
doi: 11299/59389
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conference paper or compendium article online
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15
Minnesota Geological Survey, St. Paul, MN, United States
Published in 1989
doi: 11299/59345
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16
Virginia Division of Mineral Resources, Charlottesville, VA, United States
Published in 1991
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journal article online
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17
Oklahoma Geological Survey, Norman, OK, United States
Published in 1968
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18
U. S. Geological Survey, Reston, VA, United States
Published in 1998
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19
Arizona Geological Survey, Tucson, AZ, United States
Published in 1989
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20
U. S. Geological Survey, Reston, VA, United States
Published in 2015
doi: 10.3133/fs20143101
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