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USA | |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| Zeitner, June Culp (1968) Appalachian Mineral & Gem Trails. Lapidary Journal, Inc. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| Ransom, Jay Ellis (1974) Gems and Minerals of America - A Guide to Rock Collecting. Harper & Row. |
| Zeitner, June Culp (1968) Appalachian Mineral & Gem Trails. Lapidary Journal, Inc. |
| Zeitner, June Culp (1968) Appalachian Mineral & Gem Trails. Lapidary Journal, Inc. |
| Nicolay & Stone (1967), Rocks & Minerals: A Guide For Collectors of the Eastern US |
| Ransom, Jay Ellis (1974) Gems and Minerals of America - A Guide to Rock Collecting. Harper & Row. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| Zeitner, June Culp (1968) Appalachian Mineral & Gem Trails. Lapidary Journal, Inc. |
| Ladd, Harry S. (1944) Manganese Deposits Of The Sweet Springs District West Virginia And Virginia : USGS Bulletion 940-G |
| Ladd, Harry Stephen (1944), Manganese Deposits of the Sweet Springs District West Virginia and Virginia, USGS Bulletin 940-G. |
| USGS : Tonoloway Limestone Formation |
| Zeitner, June Culp (1968) Appalachian Mineral & Gem Trails. Lapidary Journal, Inc. |
| Zeitner, June Culp (1968) Appalachian Mineral & Gem Trails. Lapidary Journal, Inc. |
| Zeitner, June Culp (1968) Appalachian Mineral & Gem Trails. Lapidary Journal, Inc. |
| Zeitner, June Culp (1968) Appalachian Mineral & Gem Trails. Lapidary Journal, Inc. |