1
per Gaskill, David L.
Washington, D.C. : U.S. Geological Survey, 1967
Washington, D.C. : U.S. Geological Survey, 1967
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2
per Gaskill, David L.
Washington, D.C. : U.S. Geological Survey, 1966
Washington, D.C. : U.S. Geological Survey, 1966
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3
per Gaskill, David L.
Washington, D.C. : U.S. Geological Survey, 1966
Washington, D.C. : U.S. Geological Survey, 1966
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4
per Gaskill, David L.
Washington, D.C. : The Survey, 1966
Washington, D.C. : The Survey, 1966
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Document de govern
Mapa
5
per Gaskill, David L.
Washington, D.C. : The Survey, 1966
Washington, D.C. : The Survey, 1966
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Mapa
6
per Gaskill, David L.
Washington, D.C. : The Survey, 1967
Washington, D.C. : The Survey, 1967
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Mapa
7
per Dyni, John R., Gaskill, David L.
[Reston, Va.] : United States Department of the Interior, Geological Survey, 1980
[Reston, Va.] : United States Department of the Interior, Geological Survey, 1980
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8
per Neal, Donald W., Gaskill, David L.
[Washington, D.C.] : United States Department of the Interior, Geological Survey, 1961
[Washington, D.C.] : United States Department of the Interior, Geological Survey, 1961
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9
10
per Young, Loyd L., 1909-, Gaskill, David L., Neal, Donald W.
Washington, D.C. : U.S. Department of the Interior, U.S. Geological Survey, 1966
Washington, D.C. : U.S. Department of the Interior, U.S. Geological Survey, 1966
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11
per Pearson, Robert Carl, 1926-, Patten, Lowell L., Gaskill, David L.
[Washington, D.C.] : United States Department of the Interior, Geological Survey, 1973
[Washington, D.C.] : United States Department of the Interior, Geological Survey, 1973
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12
per Young, Loyd L., 1909-1981, Gaskill, David L., Wayland, R. G.
Washington, D.C. : United States Department of the Interior, Geological Survey, 1963
Washington, D.C. : United States Department of the Interior, Geological Survey, 1963
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13
per Young, Loyd L., 1909-1981, Gaskill, David L., Neal, Donald W.
Washington, D.C. : United States Department of the Interior, Geological Survey, 1966
Washington, D.C. : United States Department of the Interior, Geological Survey, 1966
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14
per Wedow, Helmuth, 1917-, Banister, D'Arcy P., Gaskill, David L., Pattee, Eldon C., Peterson, Donald L.
[Washington, D.C.] : United States Department of the Interior, Geological Survey, 1975
[Washington, D.C.] : United States Department of the Interior, Geological Survey, 1975
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15
per Young, Loyd L., 1909-, Colbert, J. L., Gaskill, David L., Piper, Arthur M. (Arthur Maine), 1898-1989
Washington, D.C. : U.S. Department of the Interior, U.S. Geological Survey, 1965
Washington, D.C. : U.S. Department of the Interior, U.S. Geological Survey, 1965
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16
per Young, Loyd L., 1909-1981, Colbert, J. L., Gaskill, David L., Piper, Arthur M. (Arthur Maine), 1898-1989
[Washington, D.C.] : United States Department of the Interior, Geological Survey, 1965
[Washington, D.C.] : United States Department of the Interior, Geological Survey, 1965
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17
per Dyni, John R.
Washington : U.S. Govt. Print. Off., 1978
Altres autors:
“...Gaskill, David L....”Washington : U.S. Govt. Print. Off., 1978
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18
per Dyni, John R.
Washington : U.S. Govt. Print. Off. : For sale by the Supt. of Docs., 1980
Altres autors:
“...Gaskill, David L....”Washington : U.S. Govt. Print. Off. : For sale by the Supt. of Docs., 1980
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19
per Ratté, James Clifford, 1925-
Reston, Va. : U.S. Geological Survey, 1975
Altres autors:
“...Gaskill, David L....”Reston, Va. : U.S. Geological Survey, 1975
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