Thernstrom, Stephen et al. "Men in motion - some data and speculations about urban...[population mobility in Nineteenth-century America" Sponholtz Hist[ory] 301

Thernstrom, Stephen et al. "Men in motion - some data and speculations about urban...[population mobility in Nineteenth-century America" Sponholtz Hist[ory] 301, Box: 7, Folder: 78. Personal Papers of Lloyd Sponholtz, PP 521. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/252444 Accessed December 25, 2025.