March 11 1970
Steinbrecher Jr., Harold F.
April 10 1970
Steinbrecher Jr., Harold F.
circa 1970
Chicago Aerial Survey Co.
March 25 1970
Steinbrecher, Harold F.
February 19 1971
Steinbrecher, Harold F.
February 19 1971
Steinbrecher, Harold F.
February 13 1973
Steinbrecher, Harold F.
September 11 1972
Steinbrecher, Harold F.
November 29 1979
Steinbrecher, Harold F.
November 22 1971
Steinbrecher, Harold F.
circa 1970
U.S. Soil Conservation Service
circa 1970
U.S. Soil Conservation Service
circa 1970
U.S. Soil Conservation Service
July 21 1970 – July 31 1971
Myhrum, Arthur
May 24 1971
Kroeschell Engineering Co., Myhrum, Arthur
April 21 1971
Kroeschell Engineering Co., Myhrum, Arthur
March 16 1972
California Manufacturing Company
August 20 1971
California Manufacturing Company
August 9 1972
Kroeschell Engineering Co., Myhrum, Arthur
March 22 1973
C. L. Doucette, Inc., C. L. Doucette, Inc.
December 11 1978
Keiser Associates
December 21 1970 – May 16 1972
Myhrum, Arthur
1970s
Tyznik, Anthony
October 14 1978
Hedborn Jr., Edward A.
April 1970
Tyznik, Anthony
June 1972
Coulter, Ronald M.