After realizing that this next photo was another Allentown one, I poked around a bit. The massive industrial action in turn-of-the-century Allentown was well-documented. Some picks:


Traylor Engineering. Allentown, PA. 1910.
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Weilbacher Silk Mill. Allentown, PA. 1902.
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Allentown Platform Company (a wagon works). Allentown, PA. 1910.
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Allentown Planing Mill. Allentown, PA. 1911.
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William Taylor Company. Allentown, PA. 1919.
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