An account of the principal lazarettos in Europe; with various papers relative to the plague: together with further… https://www.rawpixel.com/image/13989608/image-papers-cloud-artFree Image from public domain licenseRailroad ties, handhewn. Principal use to which timber is put in this county, Brown County, Indiana. Sourced from the… https://www.rawpixel.com/image/12253807/photo-image-plant-forest-treeFree Image from public domain licenseHorses are the principal means of transportation for farmers who live in the hills, Puerto Rico. Sourced from the Library of… https://www.rawpixel.com/image/12321160/image-shadow-cow-personFree Image from public domain license[Untitled photo, possibly related to: Henry S. Churchill, Washington, D.C., Principal Architect of the Bound Brook, New… https://www.rawpixel.com/image/12311252/image-face-paper-personFree Image from public domain license[Untitled photo, possibly related to: Henry S. Churchill, Washington, D.C., Principal Architect of the Bound Brook, New… https://www.rawpixel.com/image/12311233/image-face-hand-personFree Image from public domain license[Untitled photo, possibly related to: Elbert Peets, Washington, D.C., Principal Town Planner, Milwaukee project, Suburban… https://www.rawpixel.com/image/12309278/image-face-person-technologyFree Image from public domain licenseCottage house vintage illustration. Remixed by rawpixel. https://www.rawpixel.com/image/11551375/image-person-art-fireView license