Note 71 — Chapter I

See Dr. Charles T. Jackson’s Geological Report to the United States Government, 1849. Foster and Whitney’s Report on the Geology of the Lake Superior Region, Part I. Published by authority of Congress in 1850, and substantially reproduced in Foster’s Pre-Historic Races of the U. S., chap. vii, in 1873. The most elaborate treatment is by Col. Charles Whittlesey, Ancient Mining on the Shores of Lake Superior. Published in the Smithsonian Contribution to Knowledge in 1863, vol. xiii. Swineford’s History and Review of the Mineral Resources of Lake Superior, Marquette, 1876. Containing Ancient Copper Mines of Lake Superior by Jacob Houghton.