Author: WRIGHT, GEORGE FREDERICK
Title: The glacial boundary in western Pennsylvania, Kentucky, Indiana and Illinois.
Description: 1890. US Geological Survey Bulletin 58; 112 pp. (pp. 13-38 intro by T.C. Chamberlin), 10 fig. 8 plts. with views/phot. Orig. wrps. spine paper-taped, otherwise very good.

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