1854. 1 in. = 18 mi 43 x 52 centimeters Scale [1: 1,140,480]. 1 inch = 18 miles General Map Collection. Surveyor General's Office (Dubuque, Iowa).
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1857. C.B. Graham's Lith., Lewis, Warner, 1805-1888, and United States. Surveyor General. 18 miles to to an inch. Includes legend. At head of title: (No. 1). "Surveyor General's Office, Dubuque, October 13th, 1857, Warner Lewis, Su... Surveyor General's Office (Dubuque, Iowa).
1854. United States. Surveyor General. Includes legend. At head of title: (No. 1) "Surveyor General's Office, Dubuque, October 21st 1854, Warner Lewis." 45 x 53 centimeters Scale [1: 1... Surveyor General's Office (Dubuque, Iowa).