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USA | |
| Smith, Arthur E. Jr. (1988) Arkansas Mineral Locality Index. Rocks & Minerals, 63 (2) 104-125 doi:10.1080/00357529.1988.11761826 |
| Illinois Geological Survey Circular 516 |
| Thomas, Andrew R. and Murray, Haydn H. (1989), Clay Mineral Segregation by Flocculation in the Porters Creek Formation: Clay and Clay Minerals: 37(2): 179-184. |
| USGS |
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| Erd, Richard C., Greenberg, Seymour S. (1960) Minerals of Indiana. Bulletin 18. Indiana Geological Survey |
| J.C. Bridges, M.M. Grady (2000) Evaporite mineral assemblages in the nakhlite (martian) meteorites. Earth and Planetary Science Letters 176:267-279 |
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| geology.deq.ms.gov (n.d.) http://geology.deq.ms.gov/mining/docs/GeologyOFR065-Operator.pdf |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
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