1.
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[Reston, Va.?] : The Survey, 1997.
I 19.76: 97-439 |
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2.
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Washington, U.S. Govt. Print. Off., 1972.
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3.
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Washington, U.S. Govt. Print. Off., 1971 [i.e. 1972]
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4.
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Washington, U.S. Govt. Print. Off., 1970.
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5.
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[Reston, Va.] : U.S. Dept. of the Interior, U.S. Geological Survey, [1996]
I 19.76: 96-501 |
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6.
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[Reston, Va.?] : U.S. Dept. of the Interior, U.S. Geological Survey, 1998.
I 19.76: 98-464 |
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7.
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[Menlo Park, CA] : U.S. Dept. of the Interior, U.S. Geological Survey, 1998.
I 19.76: 98-232 |
|