Conyngton, Mary K. (Mary Katherine), 1864-1942
and Speek, Peter A. (Peter Alexander), 1873-.
Public Service Retirement Systems: United States, Canada, and Europe : Bulletin of the United States Bureau of Labor Statistics, No. 477 ,
Washington, D.C:
G.P.O.,
January 1929, https://fraser.stlouisfed.org/title/4058,
accessed on March 4, 2026.