Publisher's Synopsis
Excerpt from Iowa Geological Survey, Vol. 10: Annual Report, 1899, With Accompanying Papers
I. Map Showing Progress of Detailed Mapping. Ii. A Geological Map of Iowa. Iii. A Portion of the Topographic Map of the Canton Quadrangle. Iv. Sketch Showing Relation Between Galena and Trenton. V. View Three-fourths of a Mile Below Specht Ferry. Vi. Copy of Illustration by D. D. Owen, Showing Process of Mining at Dubuque. Vii. Dubuque Mine Map, by H. F. Bain. Viii. Reproduction of Whitney's Dubuque Mine Map. Ix. Map of Langworthy and Kelley Crevices in Dr. Knapp's Mine. X. Sketch Map Showing Crevices in a Portion of the Pike's Peak Area xi. Water's Lead Furnace at Dubuque.
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