Cyfyngwch eich canlyniadau yn ôl:
- Pob un
- Philadelphia (Pa.), 2 canlyniadau
- Altoona (Pa.), 1 canlyniadau
- Lebanon (Pa.), 1 canlyniadau
- Pottstown (Pa.), 1 canlyniadau
- Bessemer (Ala.), 1 canlyniadau
- Birmingham (Ala.), 1 canlyniadau
- South Chicago (Chicago, Ill.), 1 canlyniadau
- Pittsburgh (Pa.), 1 canlyniadau
- Talladega (Ala.), 1 canlyniadau
- Chattanooga (Tenn.), 1 canlyniadau
- Pob un
- Quakers -- Wales, 1 canlyniadau
- Quakers -- Pennsylvania, 1 canlyniadau
- Pennsylvania -- Description and travel, 1 canlyniadau
- South Chicago (Chicago, Ill.) -- Description and travel, 1 canlyniadau
- Alabama -- Description and travel, 1 canlyniadau
- Tennessee -- Description and travel, 1 canlyniadau
- Middlesboro (Ky.) -- Description and travel, 1 canlyniadau
- Blast furnaces -- United States, 1 canlyniadau
- Tinplate industry -- United States, 1 canlyniadau
- Steel-works -- United States, 1 canlyniadau
