Gypsum from West Atlantic Basin, North America Plate
USA | |
| Cook, Robert B. (1978) Minerals of Georgia: Their Properties and Occurrences. Bulletin 92. State of Georgia Department of Natural Resources |
| Dana (1868) System 5th ed. p. 639 |
A.Mathauser collection | |
Ostrander, C. W. & W. E. Price (1940) Minerals of Maryland: Natural History Society of Maryland , 92 p. | |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
St. Mary's County, Maryland, USA