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USA | |
| Howard, J. Michael (2007) Bulletin Vol. 23, Mineral Species of Arkansas - A Digest (2nd ed.) Arkansas Geological Commission |
- Cave-In-Rock Mining Sub-District
| Mineralogical Record, v. 28, no. 1, 1997 |
| Collection of Alex Earl, collected by Bill Cordua |
| Erd, Richard C., Greenberg, Seymour S. (1960) Minerals of Indiana. Bulletin 18. Indiana Geological Survey |
| Mineralogical Record (1997) 28:3-49 |
| Goldstein, Alan (2006) Kentucky Mineral: Locality Index. Rocks & Minerals, 81 (6) 420-440 doi:10.3200/rmin.81.6.420-440 |
| Mineralogical Record: 15(4): 199-216. |
| American Mineralogist, 51: 228. |
| Rocks & Min. vol. 72 (1997) |
| R&M 72:4 pp 252-264 |
| U.S. Geological Survey/ U.s. Department of the Interior |
| Smith, Arthur E. (1991) Texas Mineral Locality Index. Rocks & Minerals, 66 (3) 196-224 doi:10.1080/00357529.1991.11761622 |
| Smith, Arthur E. (1991) Texas Mineral Locality Index. Rocks & Minerals, 66 (3) 196-224 doi:10.1080/00357529.1991.11761622 |
| Smith, Arthur E. (1991) Texas Mineral Locality Index. Rocks & Minerals, 66 (3) 196-224 doi:10.1080/00357529.1991.11761622 |
| Smith, Arthur E. (1991) Texas Mineral Locality Index. Rocks & Minerals, 66 (3) 196-224 doi:10.1080/00357529.1991.11761622 |
| (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 |
| BEG Min Res Circ 73 |
State Route 37 roadcut, Harrodsburg, Monroe County, Indiana, USA