Notes on Don Cossacks, map of 17th century Russia, Orthodox church, Tatars, Muscovy and the West, City of Moscow, Box: 1, Folder: 36-36a. Personal papers of John T. Alexander, PP 46. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/221353 Accessed November 23, 2024.