Não informado. (1947). Information Circular. State of California, Department of Natural Resources, Division of Mines.
Chicago-viite (17. p.)Não informado. Information Circular. San Francisco, Calif: State of California, Department of Natural Resources, Division of Mines, 1947.
MLA-viite (8. p.)Não informado. Information Circular. State of California, Department of Natural Resources, Division of Mines, 1947.
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