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USA | |
| Howard, J. Michael (1987) Mineral Species of Arkansas - A Digest. Bulletin Vol. 23 (1st ed.) Arkansas Geological Commission |
| Howard, J. Michael (2007) Bulletin Vol. 23, Mineral Species of Arkansas - A Digest (2nd ed.) Arkansas Geological Commission |
| Miser, H.D. (1922) Deposits of Manganese Ore in the Batesville District, Arkansas. United States Geological Survey, Bulletin 734, p. 225-226. |
| Miser, H.D. (1922) Deposits of Manganese Ore in the Batesville District, Arkansas. United States Geological Survey, Bulletin 734, at p. 231-233. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| Miser, H.D. (1922) Deposits of Manganese Ore in the Batesville District, Arkansas. United States Geological Survey, Bulletin 734, at p. 230-231. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| Miser, H.D. (1922) Deposits of Manganese Ore in the Batesville District, Arkansas. United States Geological Survey, Bulletin 734, at p. 237-238. |
| Howard, J. Michael (2007) Bulletin Vol. 23, Mineral Species of Arkansas - A Digest (2nd ed.) Arkansas Geological Commission Howard, J. Michael (1987) Mineral Species of Arkansas - A Digest. Bulletin Vol. 23 (1st ed.) Arkansas Geological Commission |
| Howard, J. Michael (2007) Bulletin Vol. 23, Mineral Species of Arkansas - A Digest (2nd ed.) Arkansas Geological Commission |
| Howard, J. Michael (2007) Bulletin Vol. 23, Mineral Species of Arkansas - A Digest (2nd ed.) Arkansas Geological Commission Howard, J. Michael (1987) Mineral Species of Arkansas - A Digest. Bulletin Vol. 23 (1st ed.) Arkansas Geological Commission |
| Howard, J. Michael (2007) Bulletin Vol. 23, Mineral Species of Arkansas - A Digest (2nd ed.) Arkansas Geological Commission Howard, J. Michael (1987) Mineral Species of Arkansas - A Digest. Bulletin Vol. 23 (1st ed.) Arkansas Geological Commission |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |