1 1924 Chicago Henry L. Banzhaf DeLos L. Hill 2 1925 Chicago Marcus L. Ward DeLos L. Hill 3 1926 Chicago Alexander W. Thornton DeLos L. Hill 4 1927 Chicago… Click to show full abstract
1 1924 Chicago Henry L. Banzhaf DeLos L. Hill 2 1925 Chicago Marcus L. Ward DeLos L. Hill 3 1926 Chicago Alexander W. Thornton DeLos L. Hill 4 1927 Chicago H. Edmund Friesell DeLos L. Hill 5 1928 Washington, DC William H.G. Logan DeLos L. Hill 6 1929 Chicago Lewis E. Ford DeLos L. Hill 7 1930 Toronto Wallace Seccombe Robert S. Vinsant 8 1931 Memphis Frank T. Breene Robert S. Vinsant 9 1932 Columbus Frederick R. Henshaw Robert S. Vinsant 1
               
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