1950s
1956 – 1957
1960
1960s
May 1934
Kammerer, E. Lowell
1939
August 1934
October 1998
Walker, Catherine
March 21 – June 20 1965
June 21 – September 20 1965
September 21 – December 20 1965
December 21 1965 – March 20 1966
March 21 – June 20 1966
June 21 – September 20 1966
September 21 – December 20 1966
1964
Kammerer, E. Lowell, Chirpe, Rodney.
September 11 1987