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USA | |
| www.jonesgeo.com (2011) http://www.jonesgeo.com/codorus.htm |
| Smith and Barnes (2008): Mineralogy, petrology, and mineralization of the Valley Quaries, Inc., Gettysburg Quarry, formerly the H. T. Campbel Quary, Adams County, Guidebook 73 rd Field Conference of Pennsylvania Geologists, p. 79 - 81. |
| Cook, Robert B. (2003) Connoisseur's Choice: Sphalerite, Eagle Mine, Gilman, Eagle County, Colorado. Rocks & Minerals, 78 (5) 330-334 doi:10.1080/00357529.2003.9926742 |
| Lapham & Geyer, 1965. Mineral Collecting in Pennsylvania |
| The Mineralogy of Pennsylvania 1966-1975 Robert C. Smith II, pgs. 23-30 |
| Econ Geol (1994) 89:1492-1500 |
Thomasville Crushed Stone Quarry, Thomasville, Jackson Township, York County, Pennsylvania, USA