Author: COOPER, G.A. ET AL.
Title: Cambrian stratigraphy and paleontology near Caborca, northwestern Sonora, Mexico.
Description: 1952. Smiths. Misc. Coll. Vol. 119, Nr. 1; 184 pp. 9 fig. 31 plts. with phot. of views (5) and fossils, incl. brachiopods (3) and trilobites (18 plts.) Orig. wrps. with very faint stamp, very good, contents uncut.

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