| Unidentified photographer Pacific Mill workers at picnic [Lower Pacific Mills, Lawrence, Massachusetts] 1906 (ca) Cyanotype 12 x 18 cm Lawrence History Center Lawrence History Center Photograph Collection, LM1 - Swartz collection box 2 outgoing (shelf locator), Accession #: 1996_124_239, Identifier: NG 344/5A LL/93879
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