Keywords: history of technology historyoftechnology mining smithsonian probably public domain probablypublicdomain blackandwhite monochrome outdoor black and white SI Neg. CCC-3084. Date: 8/28/1933....New Tram Grade Potters Fork.Pump in Operation.From the Consolidation Coal Company collection, National Museum of American History...Credit: unknown (Smithsonian Institution) SI Neg. CCC-3084. Date: 8/28/1933....New Tram Grade Potters Fork.Pump in Operation.From the Consolidation Coal Company collection, National Museum of American History...Credit: unknown (Smithsonian Institution) |