Author: MAMAY, S.H.
Title: Russellites, new genus, a problematic plant from the Lower Permian of Texas.
Description: 1968. US Geol. Surv. Prof. Paper 593-I; 15 pp. 10 fig. 3 plts. h.t. Orig. wrps. with libr. ticket taped to corner of front cover, contents very good, 4to.

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