Author: COLLIER, ARTHUR J.
Title: Geology of northeastern Montana.
Description: 1918. US Geol. Surv. Prof. Paper 120-B; pp. 17-39, 6 fig. 5 photoplts. h.t. 1 plt. h.t. with col. geol. map foling-out. Orig. wrps. with libr. ticket, otherwise very good, 4to.

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