There are many genres of postcard collecting, technically referred to as Deltiology. This site represents a collection of postcards that focuses on libraries in the United States and throughout the world. Reproductions of many of these vintage postcards are available for purchase.
1907 New Carnegie Library, Pittsburgh, Pennsylvania
[LIB2361] The William R. Oliver Special Collections Room The William R. Oliver Special Collections Room houses Carnegie Library of Pittsburgh's collection of rare and unique materials including books, manuscripts, personal papers and historic photographs. In addition, the archives of the Carnegie Museums and Library of Pittsburgh are maintained and preserved because of their continuing legal, fiscal and historical value to the institution. [Website]