Não informado. (1947). Information Circular. State of California, Department of Natural Resources, Division of Mines.
Citace podle Chicago (17th ed.)Não informado. Information Circular. San Francisco, Calif: State of California, Department of Natural Resources, Division of Mines, 1947.
Citace podle MLA (8th ed.)Não informado. Information Circular. State of California, Department of Natural Resources, Division of Mines, 1947.
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