2020-10-072022-02-032020-10-072022-02-03https://hdl.handle.net/11124/175184Caption reads: "Mill, Rex, Colo. Oct. 8, 1927."Donor: Friends of Mineralogy, Colorado Chapter.Mill building on the flat, with canyon cliffs in the background.5 x 3 inchesblack-and-white photographsUnderground mining -- ColoradoMineral processing plantsZinc mines and mining -- ColoradoMills and mill-work -- ColoradoStillImage