Series 31 of record group 59-4. Item 01016. Printed map of Calhoun County. Date: c. 1844. The map was published under the direction of Douglass Houghton, state geologist, pursuant to an act of the Legislature of the state of Michigan. "W.J. Stone, Sc. Washn. City." Profile of the Central Railroad on lower part of map. Scale of 2 miles or 10,560 ft. : 1 in.