Mahaska County: Township 74 North, Range 17 West, 5th Meridian <a href="/items/browse?advanced%5B0%5D%5Belement_id%5D=49&advanced%5B0%5D%5Btype%5D=is+exactly&advanced%5B0%5D%5Bterms%5D=Des+Moines+River+Plat+Map+">Des Moines River Plat Map </a> The Des Moines River Grant Plat Book is a collection of maps that were created between 1837-1851 and detail the land by county and township of the developing State of Iowa. Details show land ownership, depict the raw land and natural occurrences, and indicate societal movements of that time. The territory surveyed in the Des Moines River Grant Plat Book quantify the land below the forks of the Raccoon and Des Moines Rivers and the maps were sold by the State of Iowa to individuals per plat between the years of 1849-1857. Total amount of land surveyed with the grant equals 267,507.64 acres. Surveyor General's Office State Library of Iowa Surveyed in 1844 & 1845 William Dewey, George Wallace Jones This digital image may be used for educational purposes, as long as it is not altered in any way. No commercial reproduction or distribution of this file is permitted without written permission of the State Library of Iowa. This map is included in the Des Moines River Grant: Plat Map book. Map 1844-1847