Some pictures, two of the Ben Shahn murals at the Bronx post office and four manhole covers.
African-American riveter
If you’re not sure that’s a rivet gun he’s holding, Google “riveter,” … I dare you. So much for crowd-sourcing.
Mill worker tending cotton spindles
square Dept. of Sanitation manhole cover
PSC IRT manhole cover
Unlabeled parquet pattern manhole cover
George H. Toop Iron Works