Keywords: history of technology historyoftechnology mining smithsonian probably public domain probablypublicdomain blackandwhite monochrome black and white SI Neg. CCC-2901. Date: 1/10/1930....Long Wall Ready for Shot Mine 206.From the Consolidation Coal Company collection, National Museum of American History...Credit: unknown (Smithsonian Institution) SI Neg. CCC-2901. Date: 1/10/1930....Long Wall Ready for Shot Mine 206.From the Consolidation Coal Company collection, National Museum of American History...Credit: unknown (Smithsonian Institution) |