What reading level is Reports of Explorations Printed in the Documents of the U. S. Government. book?
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[1845-1848.] 1849. 935 pp. 8° ills. 15 maps. (31st Cong., 1st sess., Senate ex. doc. 1, pt. 3, in v. 3.) Maps: East sectional view of Copper Falls Mine, Jan., 1849. Scale 50 ft. = 1 in. 8f x 13|. Geological map of Keweenaw Point, Lake Superior. Scale 1 m. = 1 in. Geological map of Isle Boyale, Lake Superior. Scale 1 m. = 1 in. Plan of the underground work of the Lao Labelle mines. Oct., 1847. Scale 100 ft = 1 in. Underground work of the K. W. mines. Oct., 1847. Scale 10 chains = 2J in. 94 x 144.... Topographical and underground plan of the Cliff mine on Keweenaw Point. Scale 58 ft= lin. 10}xl4*. Geological map of Isle Boyale. (Same above.) Geological map of Keweenaw Point, Lake Superior. Scale 2m.=l^ in. 9f x 19§. Geological map of the district between Keweenaw Bay and Chocolate Biver. Scale 1 m.= fin. 18}x22|. Geological map of the district between Portage Lake and Montreal Biver, Lake Superior. Scale 2 m. = lin. 14*x28U. Geological map of townships in the northern peninsula of Michigan.
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