Author: COBBAN, W.A.
Title: Characteristic marine molluscan fossils from the Dakota Sandstone and intertongued Mancos Shale, west-central New Mexico.
Description: 1977. United States Geological Survey Prof. Pap. 1009; 30 pp. 21 plts. with molluscs, incl. ammonites h.t. Orig. wrps. libr. stamp, very good, 4to.

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