Bek, J.; Leary, R. L. (2012). Porostrobus nathorstii (Leary & Mickle) emend. and its spores from the Namurian of Illinois, USA. Bulletin of Geosciences. 87(1): 45-52.
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Bek, J.; Leary, R. L.
2012
Porostrobus nathorstii (Leary & Mickle) emend. and its spores from the Namurian of Illinois, USA