ADDITIONAL INFORMATION

More information on the Putnam Competition can be found in two articles in the May 1965 issue of the American Mathematical Monthly. Garrett Birkhoff described in one the early history and L. E. Bush gave in the other the later history and a summary of results up to that time. There are two Putnam problem books that contain collections of problems with solutions as well as historical information about the competition: (1) A. M. Gleason, R. E. Greenwood and L. M. Kelly, The William Lowell Putnam Mathematical Competition/Problems and Solutions: 1938-1964, and (2) Gerald L. Alexanderson, Leonard F. Klosinski and Loren C. Larson, The William Lowell Putnam Mathematical Competition/Problems and Solutions: 1965-1984. Both are out of print.
The questions on the Putnam examination are regularly published in the Monthly. The following issues of the Monthly contain questions, and sometimes solutions, for earlier competitions:

 May 1942 Oct . 1946 Aug.-Sept. 1947 Dec. 1948
Aug.-Sept. 1949 Aug.-Sept. 1950 Aug.-Sept. 1951 Oct. 1952
Oct. 1953 Oct. 1954 Oct. 1955 Jan. 1957
Nov. 1957  Jan. 1961 Aug.-Sept. 1961 Oct. 1962
Aug.-Sept. 1963 June-July 1964 Aug.-Sept. 1965 Aug.-Sept. 1966
Aug.-Sept. 1967 Aug.-Sept.1968  Oct. 1969 Aug.-Sept. 1970
Aug.-Sept. 1971 Feb. 1973 Nov. 1973 Dec. 1974
Nov. 1975 Nov. 1976 Jan. 1978 Mar. 1979
Nov. 1979 Oct. 1980 Oct. 1981 Nov. 1982
Oct. 1983 Oct. 1984  Oct. 1985  Oct. 1986 
Oct. 1987  Oct. 1988  Oct. 1989  April 1991 
Oct. 1991  Oct. 1992  Oct. 1993  Oct. 1994
Oct. 1995 Oct. 1996 Oct. 1997