Case & Billings correspondence, 1869-1877; 1870-1876; November 9, 1870-June 17, 1876, Volume: 45-47. Case & Billings business records, RH MS 62. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/438937 Accessed July 13, 2025.