BELL, W.C. & H.L. ELLINWOOD
Upper Franconian and Lower Trempealeauan Cambrian trilobites and brachiopods, Wilberns Formation, Central Texas.
1962. Univ. Texas, Bureau of Economic Geology Rep. Invest. No. 47, reprint: J. Paleont. 36; pp. 385-423, 1 fig. 14 plts. h.t. with trilobites (9 plts ), brachiopods and few molluscs. Orig. wrps. ringbinder, very good, 4to.
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