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1907, 1st ed. --, xiii, 176
Book
1927, Benn's mining series, 432
Book
1972, 2nd ed., ISBN 0592000796, 250
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1976, Report of investigations / United States Department of the Interior, Bureau of Mines, Volume 8193., 19
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1968, Information circular / United States Department of the Interior, Bureau of Mines, Volume 8365., 23
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1965, Information circular / United States Department of the Interior, Bureau of Mines, Volume 8273., ii, 28
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