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| Hower, James C., Cortland F. Eble, Jennifer M. K. O'Keefe, Shifeng Dai, Peipei Wang, Panpan Xie, Jingjing Liu, Colin R. Ward, and David French. (2015) "Petrology, Palynology, and Geochemistry of Gray Hawk Coal (Early Pennsylvanian, Langsettian) in Eastern Kentucky, USA" Minerals 5, no. 3: 592-622. https://doi.org/10.3390/min5030511 |
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| Anderson (1994) Kentucky Geol. Survey Ser. XI Spec. Pub 20 |
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| Goldstein, Alan (2006) Kentucky Mineral: Locality Index. Rocks & Minerals, 81 (6) 420-440 doi:10.3200/rmin.81.6.420-440 |
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| Chamberlain, Steven C., Robinson, George W., Dix, George R., Hall, Chris (2001) Famous Mineral Localities: Rossie, New York. The Mineralogical Record, 32 (4) 273-293 |
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| Smith, Arthur E. (1991) Texas Mineral Locality Index. Rocks & Minerals, 66 (3) 196-224 doi:10.1080/00357529.1991.11761622 |
US highway 27 roadcut, Halls Gap, Lincoln County, Kentucky, USA