Keywords: history of technology historyoftechnology mining smithsonian probably public domain probablypublicdomain blackandwhite monochrome outdoor black and white SI Neg. CCC-3097. Date: 10/10/1934....Grader on Tram Road Potters Fork.Machinery.From the Consolidation Coal Company collection, National Museum of American History...Credit: unknown (Smithsonian Institution) SI Neg. CCC-3097. Date: 10/10/1934....Grader on Tram Road Potters Fork.Machinery.From the Consolidation Coal Company collection, National Museum of American History...Credit: unknown (Smithsonian Institution) |