About 4000 letters in 8 volumes, mostly to M.K. Jesup and J.B. Dumont from Dubuque officials about operations of road, local affairs, and land matters, with some from legislators, attorneys, bankers and brokers about legal matters, securities, legislation, etc., and from IC officials in Chicago concerning relations at Dubuque, and from The Iowa Land and Loan Co., Iowa Homestead Co., Western Railroad Association, and other organizations. No letters for 1871 and 1874.