Não informado. (2001). Special Report. California Division of Mines and Geology.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Special Report. San Francisco, Calif: California Division of Mines and Geology, 2001.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Special Report. California Division of Mines and Geology, 2001.
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