digitalgallery.nypl.org/nypldigital/dgkeysearchresult.cfm
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| Inspecting barrel bridges, Hamilton Watch factory, Lancaster, Pennsylvania (1900-1937) | Skilled cabinet workers in radio cabinet shop, Camden, New Jersey (1900-1937) |
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| Precision mechanic using depth gauge on a metal boring | Tenement playground, New York (1900-1937) |
