September 1 1961
Wheeler, Hudson L.
November 9 1961
Steinbrecher, Harold F.
September 9 1964
Steinbrecher, Harold F.
June 1964
U.S. Soil Conservation Service
May 2 1967
Kroeschell Engineering Co.
1960s
Tyznik, Anthony
March 1962
Arthur Myhrum & Edward H. Bennett, Jr.