- Iowa Geological Survey, Vol. XXXI. Annual reports, 1923 and 1924, with accompanying papers.

1924. 400 pp. 28 fig. 27 plts. includes: Water, O.T.: Trilobites of Iowa and some related paleozoic forms; pp. 167-389, 6 fig. 18 plts. Orig. cloth, gilt, libr. stamp on title page, very good.

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