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  1. 1
    by Grant, R. L.
    Published 1956
    [Washington, D.C.] : U.S. Dept. of the Interior, Bureau of Mines, 1956.
    10 p. : ill. ; 27 cm.
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  2. 2
    Published 1956
    [Washington, D.C.] : U.S. Dept. of the Interior, Bureau of Mines, 1956.
    33 p. : ill. ; 27 cm.
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