Erlenmeyer flasks full of liquid and wood samples. Forest Products laboratory, Madison, Wisconsin by Russell Lee https://www.rawpixel.com/image/12147584/image-art-vintage-forestFree Image from public domain licenseThe pasteurizing unit at the Burlington cooperative milk bottling plant. Burlington, Vermont. Sourced from the Library of… https://www.rawpixel.com/image/12282348/photo-image-plant-technology-public-domainFree Image from public domain license[Untitled photo, possibly related to: Kingman (vicinity), Arizona. Mr. Relling, in the laboratory, analyzing tungsten ore… https://www.rawpixel.com/image/12297283/photo-image-face-plant-personFree Image from public domain licenseChristiansted, Saint Croix Island, Virgin Islands (vicinity). In the Government House rum distillery of the Virgin Islands… https://www.rawpixel.com/image/12280210/photo-image-hand-person-public-domainFree Image from public domain license[Untitled photo, possibly related to: Farmer getting his empty milk cans back at the Burlington cooperative milk bottling… https://www.rawpixel.com/image/12282123/photo-image-plant-person-smokeFree Image from public domain licensePasteurizing and bottling plant. Greendale, Wisconsin. Sourced from the Library of Congress. https://www.rawpixel.com/image/12285284/photo-image-plant-public-domain-factoryFree Image from public domain license