Keywords: history of technology historyoftechnology mining smithsonian probably public domain probablypublicdomain blackandwhite monochrome outdoor black and white SI Neg. CCC-2500. Date: 12/17/1923....Concrete Draynage Pipe 201 Slate Hollow.Concrete Drainage Pipe, No. 201 Slate Hollow (print adhered to 2483).From the Consolidation Coal Company collection, National Museum of American History...Credit: unknown (Smithsonian Institution) SI Neg. CCC-2500. Date: 12/17/1923....Concrete Draynage Pipe 201 Slate Hollow.Concrete Drainage Pipe, No. 201 Slate Hollow (print adhered to 2483).From the Consolidation Coal Company collection, National Museum of American History...Credit: unknown (Smithsonian Institution) |