Author: DOUGLAS, J.A.
Title: The geology of the Marcapata Valley in eastern Peru; with an appendix on the graptolites from the Quitari area by O.M.B. Bulman.
Description: 1933. Quart. J. Geol. Soc. 89; pp. 308-356, 5 fig. 3 photoplts. h.t. 2 plts. h.t. with fossils (molluscs and trilobites), 1 plt. with graptolites. Orig. wrps. with faint libr. stamp, stapled extract, very good.

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