Monocyclic Psaronius from the lower Pennsylvanian of the Illinois Basin

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DeMichele, William A. and Phillips, Tom L. 1977. "<a href="https://repository.si.edu/handle/10088/34968">Monocyclic Psaronius from the lower Pennsylvanian of the Illinois Basin</a>." <em>Canadian Journal of Botany</em>, 55 2514–2524.

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