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Micropaleontology; July 1978; v. 24; no. 3; p. 303-315

Morphology and ultrastructure of four Pennsylvanian prepollen types
Michael A. Millay, Donald A. Eggert, and Robert L. Dennis
(American Journal of Botany. 2003;90:1239-1252.)
On Paleozoic plants from marine strata: Trivena arkansana (Lyginopteridaceae) gen. et sp. nov., a lyginopterid from the Fayetteville Formation (middle Chesterian/Upper Mississippian) of Arkansas, USA
Michael T. Dunn, Gar W. Rothwell and Gene Mapes

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