From the KLVX Steamboats on the Colorado Photograph Collection (PH-00156). Written on photo sleeve: "Salt mine. (Colorado River area)." Handwritten on verso: "Courtesy Special Collections UNLV."
From the KLVX Steamboats on the Colorado Photograph Collection (PH-00156). "Courtesy of Dickinson Library Special Collections Dept. University of Nevada, Las Vegas Las Vegas, Nevada" stamp on verso.