| Photo Thumbnail | Photo Title |
| 69-RH-4E-4
Electricity on modern farms in Pennsylvania. Photo taken in 1935. |
| 69-RH-4E-4A
Treshing wheat in the Midwest. Photo taken in 1935. |
| 69-RH-4E-5
Joe, the trackwalker, Pennsylvania Railroad. Photo taken in 1921. |
| 69-RH-4E-8
Five-horse team disking on Indiana farm. Photo taken in 1925. |
| 69-RH-4J-1
Worker at loom. Photo taken in 1925. |
| 69-RH-4J-23
School in Pennsylvania. Photo taken in 1925. |
| 69-RH-4K-1
Old-timer keeping up with the boys. Many structural workers were above middle age - Empire State Building. Photo taken in 1930. |
| 69-RH-4K-13
Welding beams on Empire State Building. Photo taken in 1930. |
| 69-RH-4K-14
Checking up on vertical lines of Empire State Building. Photo taken in 1930. |
| 69-RH-4K-15
Hoist-engineer on Empire State Building. Photo taken in 1930. |
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