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.
March 7 1972
Steinbrecher, Harold F.
November 22 1971
Steinbrecher, Harold F.
November 7 1974
circa 1970
U.S. Soil Conservation Service
circa 1970
U.S. Soil Conservation Service
circa 1970
U.S. Soil Conservation Service
July 21 1970 – February 7 1971
May 24 1971
Kroeschell Engineering Co.
May 24 1971
Kroeschell Engineering Co.
February 16 – March 17 1972
California Manufacturing Company
February 16 – March 17 1972
California Manufacturing Company
August 31 1971
Kroeschell Engineering Co.
March 22 1973
C. L. Doucette, Inc.
March 22 1973
C. L. Doucette, Inc.
December 11 1978
Keiser Associates
October 17 1977
Clark, Dietz & Associates, Engineers, Inc.