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1
Minerals yearbook. Graphite.
[Pittsburgh, Pa.] : U.S. Dept. of the Interior, Bureau of Mines, 1988“…Bureau of Mines Minerals yearbook. Graphite…”
Format: Government Document Serial
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2
Graphite.
Washington, DC : U.S. Dept. of the Interior, Bureau of Mines, 1991“…Minerals yearbook. Graphite…”
Format: Government Document Serial
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