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1
by Pigott, P. G.
[Washington, D.C.] : U.S. Dept. of Interior, Bureau of Mines, 1971
[Washington, D.C.] : U.S. Dept. of Interior, Bureau of Mines, 1971
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Government Document
Book
2
by Pigott, P. G.
[Washington, D.C.] : U.S. Dept. of Interior, Bureau of Mines, 1971
[Washington, D.C.] : U.S. Dept. of Interior, Bureau of Mines, 1971
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Book
3
by Pigott, P. G.
[Washington, D.C.] : U.S. Dept. of Interior, Bureau of Mines, 1971
[Washington, D.C.] : U.S. Dept. of Interior, Bureau of Mines, 1971
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