|
USA | |
| Jeffrey J. Agee, James R. Garrison, Jr. and Lawrence A. Taylor (1982) Petrogenesis of oxide minerals in kimberlite, Elliot County, Kentucky. American Mineralogist 67:28-42 |
| www.rkci.org (2008) http://www.rkci.org/library/gsp/engle.htm |
| Jensen (1978) Minerals of New York State, p.173 |
| Steven C. Chamberlain & George W. Robinson (2013) Collector's Guide to the Minerals of New York State. Schiffer Books. |
| Steve Chamberlain et al (2009) "Minerals of the Phosphate vein, Bower Powers Farm, Pierrepont, St. Lawrence Co., NY." The 36th Rochester Mineralogical Symposium, April 23-26, programme abstracts, 13-15. |
| Paris, Travis A. (2011) Tennessee Mineral Locality Index. Rocks & Minerals, 86 (4) 300-329 doi:10.1080/00357529.2010.517132 |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| Rocks & Minerals: 66(3): 196-224. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| Smith, Arthur E. (1991) Texas Mineral Locality Index. Rocks & Minerals, 66 (3) 196-224 doi:10.1080/00357529.1991.11761622 |