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Corn in contoured field on the Davey farm.
Corn in contoured field on Ray Davey's farm in Warren County, Iowa.
Residue contoured crops on the farm of Fred Conley.
Photos of the Fred Conley farm with residue contoured crops in Cherokee County, Iowa.
Contoured cornfield.
Photo of contoured cornfield in Cherokee County, Iowa.
Contoured cornfield after heavy rain.
Photo of a contoured cornfield after heavy rain in Cherokee County, Iowa..
Contoured cornfield.
Photo of contoured cornfield in Cherokee County, Iowa.
Field of contoured beans on the Duncan farm.
Photo of a field of contoured beans on the Duncan farm in Cherokee County, Iowa..
Donald Gray driving new 2-way plow, 1966
Donald Gray driving new 2-way plow to assist with Gray farm's 300 acres of contoured crops.
Contour Crops.
Contour crops in Dickinson County, Iowa.
Farmland in Dickinson County.
Aerial photos of farmland in Dickinson County, Iowa.
Contour Bean Field - Minimum Tillage on the Smith Farm.
Contour bean field with minimum tillage on the Smith farm in Okoboji Township, Dickinson County, Iowa. (Old ponderosa farm).