Author:
Title: Iowa Geological Survey, Vol. XXVIII. Twenty-Sixth and Twenty-Seventh Annual Reports, 1917 and 1918.
Description: 1918, a.o. Wilder, F.A.: Gypsum: its occurrence, origin, technology, and uses; pp. pp. 47-558, 113 fig. 13 plts. Orig. wrappers with libr. stamp.

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