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Geolocation
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Author - title
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Year
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| details | Allegheny | Pennsylvania | Frederiksen,N.O. Sporomorphs of the Brookville Seam near Brookville, Pennsylvania. | 1961 | |
| details | Westphalian D | France | Alpern,B. Contribution to the palynological and petrographic study of French Coals. | 1959 | |
| original | Westphalian D | France | Alpern,B. et al. Description of some microspores of the French Permo-Carboniferous. | 1958 |