Fred Coulter's hired men attaching spike tooth harrow to tractor. Grundy County, Iowa. Sourced from the Library of Congress. https://www.rawpixel.com/image/12284445/photo-image-person-public-domain-natureFree Image from public domain licenseChristiansted, Saint Croix Island, Virgin Islands (vicinity). At an elementary school. Sourced from the Library of Congress. https://www.rawpixel.com/image/12279976/photo-image-face-person-shirtFree Image from public domain licenseUsing spring tooth harrow. Grundy County, Iowa. Sourced from the Library of Congress. https://www.rawpixel.com/image/12284405/photo-image-cloud-plant-personFree Image from public domain license