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1. A new geological map of Wisconsin prepared mostly from original observations; by I.A. Lapham.

1869. Lapham, Increase Allen, 1811-1875. Entered for copyright by both Lapham and Silas Chapman. "Lith. by L. Lipman, Milmaukee." Includes "Geological section, from Prairie du Chien to Mil...

2. Geological map of Michigan; by Alexander Winchell.; Geil's map of Michigan

1869. Winchell, Alexander, 1824-1891.,Geil, Samuel. Entered according to act of Congress in the year 1865 by Samuel Geil... Includes "Epitome of the geology of Michigan," population table, and inset ...