1957
20th century
1940 – 1950
Watts, May Theilgaard
1958 – 1959
November 1950
Kammerer, E. Lowell
January 1952
May 1953
October 1954
December 1956
March 1957
July 1958
October 1959
1959
1952
1950s
1958
October 24 1957
February 1953
circa 1950
1955
July 1 1953
Steinbrecher, Harold F.
June 25 1957