Keywords: history of technology historyoftechnology mining smithsonian probably public domain probablypublicdomain blackandwhite monochrome outdoor black and white SI Neg. CCC-2737. Date: na....White Truck Loaded with Mine Props.From the Consolidation Coal Company collection, National Museum of American History...Credit: unknown (Smithsonian Institution) SI Neg. CCC-2737. Date: na....White Truck Loaded with Mine Props.From the Consolidation Coal Company collection, National Museum of American History...Credit: unknown (Smithsonian Institution) |