Ober Joyce A & U.S. Geological Survey. 2005 minerals yearbook , sulfur.
Chicago-čujuhus (17. p.)Ober Joyce A juo U.S. Geological Survey. 2005 Minerals Yearbook , Sulfur.
MLA-čujuhus (9. p.)Ober Joyce A juo U.S. Geological Survey. 2005 Minerals Yearbook , Sulfur.
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