Não informado. (2001). Special Report. California Division of Mines and Geology.
Lua i Stíl Chicago (17ú heag.)Não informado. Special Report. San Francisco, Calif: California Division of Mines and Geology, 2001.
Lua MLA (8ú heag.)Não informado. Special Report. California Division of Mines and Geology, 2001.
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