|
USA | |
| [var. Williamsite] Ostrander, C. W. & W. E. Price (1940) Minerals of Maryland: Natural History Society of Maryland, 27p. |
| Ref: Minerals of the Washington, D.C. Area |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| Pearre, N. C., Van Heyl, A. (1960) Chromite and other mineral deposits in serpentine rocks of the Piedmont Upland, Maryland, Pennsylvania, and Delaware. Bulletin Vol. 1082 (1082k) US Geological Survey doi:10.3133/b1082k Ostrander, C. W. & W. E. Price (1940) Minerals of Maryland: Natural History Society of Maryland , 92 p. |
- Jarretsville-Dublin Mining District
| [var. Williamsite] Pearre, N. & A. V. Heyl (1960) Mineral deposits in serpentine rocks of the Piedmont Upland, Maryland, Pennsylvania and Delaware: U. S. Geological Survey: Bulletin 1082K: 765-766. |
| Ostrander, C. W. & W. E. Price (1940) Minerals of Maryland: Natural History Society of Maryland , 92 p. |
| [var. Williamsite] Ostrander, C. W. & W. E. Price (1940) Minerals of Maryland: Natural History Society of Maryland , 92 p. |
| Bernstein, Lawrence R. (1980) Minerals of the Washington, D.C. area. Maryland Geological Survey Educational Series 5, 148 pages. |
| Jat Thompson Collection |
Line pit, Cecil County, Maryland, USA