Gears and all machinery in a cotton seed oil mill are covered with a fine dust. Cotton seed oil mill. McLennan County, Texas… https://www.rawpixel.com/image/12147301/image-person-art-vintageFree Image from public domain licenseType of drop gate for loading of cotton seed hulls onto trucks. Cotton seed oil mill. McLennan County, Texas by Russell Lee https://www.rawpixel.com/image/12148407/image-art-pattern-vintageFree Image from public domain license[Untitled photo, possibly related to: Active gold mill in San Juan County, Colorado. A great deal of water is necessary to… https://www.rawpixel.com/image/12148828/image-person-art-vintageFree Image from public domain license