Não informado. (1967). Minerals Yearbook. U.S. Department of the Interior, Bureau of Mines.
Citace podle Chicago (17th ed.)Não informado. Minerals Yearbook. Washington: U.S. Department of the Interior, Bureau of Mines, 1967.
Citace podle MLA (8th ed.)Não informado. Minerals Yearbook. U.S. Department of the Interior, Bureau of Mines, 1967.
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