1. Phosphate Rock, Industrial Minerals and Rocks;Bartels,1994
2. Where is Florida's Phosphate Industry Going?;Harben;Industrial Minerals,1980
3. Phosphate Rock;Stowasser;1981 Bureau of Mines Mineral Industry Surveys,1982
4. U.S. Phosphates-Abundant Resources Will Last for Hundreds of Years;Sandvik;Engineering and Mining Journal,1979
5. Effect of Sodium Chloride on Flotation of Dolomite from Apatite;Moudgil;Mineral and Metallurgical Processing,1991