Não informado. (2020). Press Bulletin. State of California, Department of Natural Resources, Division of Mines.
Chicago-Zitierstil (17. Ausg.)Não informado. Press Bulletin. San Francisco, Calif: State of California, Department of Natural Resources, Division of Mines, 2020.
MLA-Zitierstil (8. Ausg.)Não informado. Press Bulletin. State of California, Department of Natural Resources, Division of Mines, 2020.
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