Author: Mamay, S.H., & Yochelson, E.L., 1962.:
Title: Occurrence and significance of marine animal remains in American coal balls.
Description: [U.S. Geol. Surv. Prof. Pap., 354-I.] Washington. 4to. Pp. iv,193-224, several photos on 9 pls., 3 tabs., 4 figs., refs., index. Orig. wrs. - Carboniferous.

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