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Canada | |
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| Rocks & Min.: 14:149. |
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China | |
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| Zhuang, X., Querol, X., Zeng, R., Xu, W., Alastuey, A., Lopez-Soler, A., and Plana, F. (2000): International Journal of Coal Geology 45(1), 21-37. |
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| Zhuang, X., Querol, X., Zeng, R., Xu, W., Alastuey, A., Lopez-Soler, A., and Plana, F. (2000): International Journal of Coal Geology 45(1), 21-37. |
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Germany | |
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| Harder, H. (1954): Contributions to Mineralogy and Petrology 4(1/2), 54-66. |
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USA | |
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| Tenney, J.B. (1928), The mineral industries of Arizona, AZ Bur. Mines Bull. 125: 111-112. |
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| Tenney, J.B. (1928), The Mineral Industries of Arizona, AZ Bur. Mines Bull. 125: 111. |
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| http://www.epa.gov/cmop/pdf/stu001.pdf |
|
| Rocks & Min.: 17:5. |
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| Field description of coal By Russell R. Dutcher, American Society for Testing and Materials. Committee D-5 |
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| Field Guide of Common Rocks and Minerals-Fredrick Brewster Loomis-1948 |
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| Field Book of Common Rocks and Minerals- Fredrick Brewster Loomis-1948 |
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| Kentucky Geological Survey |
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| Maryland Geological Survey, Vol. VIII (1909): 107. |
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| Maryland Geological Survey, Vol. VIII (1909): 107. |
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| Maryland Geological Survey, Vol. VIII (1909): 108. |
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| Maryland Geological Survey, Vol. VIII (1909): 107. |
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| Maryland Geological Survey, Vol. VIII (1909): 107. |
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| Maryland geological Survey, Vol. VIII (1909): 107. |
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| Maryland geological Survey, Vol. VIII (1909): 107. |
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| Maryland Geological Survey, Vol. VIII (1909): 107. |
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| Maryland Geological Survey, Vol. VIII (1909): 107. |
|
| Maryland Geological Survey, Vol. VIII (1909): 108. |
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| Field Guide of Common Rocks and Minerals - Fredrick Brewster Loomis-1948 |
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| Field Book of Common Rocks and Minerals- Fredrick Brewster Loomis -1948 |
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| Jay Ellis Ransom,1974,Gems and Minerals of America |
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| Field Book of Common Rocks and Minerals - Fredrick Brewster Loomis-1948 |
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| Gems and Minerals of America-Jay Ellis Ransom-1974 |
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| State Board of Agriculture, Raleigh,1896, North Carolina and its Resources |
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| North Carolina Geological Survey |
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| North Carolina Geological Survey |
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| Gems and Minerals Of America-Jay Ellis Ransom-1974 |
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| Field Book of Common Rocks and Minerals- Fredrick Brewster Loomis-1948 |
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| Field Guide of Common Rocks and Minerals -Fredrick Brewester Loomis-1948 |
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| Tennessee Geological Survey |
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| Field Book of Common Rocks and Minerals - Fredrick Brewester Loomis-1948 |
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| Field Book of Common Rocks and Minerals - Fredrick Brewster Loomis-1948 |
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