PFEFFERKORN, H.W. - Pennsylvanian tree fern compressions Caulopteris, Megaphyton, and Artisophyton gen. nov. in Illinois.

1976. Illinois St. geol. Surv. Circ. 492; 31 pp. 13 fig. 6 plts. Orig. wrps. with libr. stamp, very good.

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