Não informado. (1948). Mineral Information Service. California Division of Mines and Geology.
Lua i Stíl Chicago (17ú heag.)Não informado. Mineral Information Service. Sacramento, Calif: California Division of Mines and Geology, 1948.
Lua MLA (8ú heag.)Não informado. Mineral Information Service. California Division of Mines and Geology, 1948.
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