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Zeolites
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The Valuing of Mining Projects
Vaughn, Lewis (editor) Prevention Magazine's Complete Book of Vitamins and Minerals (1988) New York: Wings Books
Vitamin Supplements and the Dietician
Zim, H.S. & Shaffer, P.R. (1957). Rocks and Minerals. New York: Western.
Crystalline Silica in the Workplace
Salt - Roskill Metals and Minerals Report. 2001 (retrieved April 2, 2004). "World demand continues to rise" http://www.roskill.com/reports/salt?currencySymbol=USD
Salt
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