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To
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Geolocation
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Author - title
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Year
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| details | Allegheny | Ohio | Gray,L.R. Palynology of four Allegheny Coals, northern Appalachian Coal Field. | 1967 | |
| original | Allegheny | Pennsylvania | Frederiksen,N.O. Sporomorphs of the Brookville Seam near Brookville, Pennsylvania. | 1961 |