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Society for Commerical Archeology. Established in 1977, SCA is the oldest national organization devoted to the buildings, artifacts, structures, signs and symbols of the twenthieth century commerical landscape.
American Social History Online. Aquifer American Social History Online is a research project of the Digital Library Federation and is focused on finding, gathering and collecting distributed and disparate scholary content in American Social History.
Historic Pittsburgh Image Collections. The site provides access to over 13,000 visual images from 44 collections held by the Archives Service Center at the University of Pittsburgh, Carnegie Museum of Art, Chatham University Archives, the Library & Archives at the Heinz History Center, Pittsburgh History & Landmarks Foundation and Point Park University.