Wagonload of hybrid corn. H.C. Clarke farm. Grundy County, Iowa. Sourced from the Library of Congress. https://www.rawpixel.com/image/12274732/photo-image-plant-grass-skyFree Image from public domain licenseHarvesting hybrid corn with mechanical picker. Grundy County, Iowa. Sourced from the Library of Congress. https://www.rawpixel.com/image/12272993/photo-image-plant-person-public-domainFree Image from public domain licenseHybrid seed corn plant. Reinbeck, Iowa. Sourced from the Library of Congress. https://www.rawpixel.com/image/12283254/photo-image-plant-sky-public-domainFree Image from public domain license