Author:
Title: Iowa Geological Survey, Vol. XXX Annual reports, 1921 and 1922, with accompanying papers.
Description: 1922. 374 pp. 16 fig. 6 plts. With: F.M. van Tuyl: The stratigraphy of the Mississippian formations of Iowa; pp. 33-349, 5 plts. (4 w. fossils), 1 fold. pl. w. col. geol. map. Orig. cloth, gilt, libr. stamp on title page, very good.

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