1. Allen's outline map of Ottumwa, Iowa, 1891 Maps University Of Iowa Public content 1890. Allen, C. R., active 1878-1908. 1 map Scale [1:12,000]. 1 inch = 1000 feet. C.R. Allen.
2. Map of Wapello County, Iowa, 1893 Maps University Of Iowa Public content 1890. Allen, C. R. 1 map on 6 sheets. C.R. Allen Engr & Surveyor.