Não informado. (1931). Mineralogist. Oregon Agate and Mineral Society.
Lua i Stíl Chicago (17ú heag.)Não informado. Mineralogist. Portland, Ore: Oregon Agate and Mineral Society, 1931.
Lua MLA (8ú heag.)Não informado. Mineralogist. Oregon Agate and Mineral Society, 1931.
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