• Independent Research Libraries Association (IRLA)
  Addresses the common needs and aspirations of independent, privately-supported research libraries: How to preserve the cultural heritage represented in library collections, how to serve the public and the academy, and how to finance and manage private libraries. Established in 1972. Site includes a member directory.
  in Organizations with association libraries organizations research
• LibDex - The Library Index
  A worldwide directory of library homepages, web-based Online Public Access Catalogs (OPACs), Friends of the Library pages, and library e-commerce affiliate links.
  in Databases with catalogues databases index libraries by 8 users
• Philadelphia Area Consortium of Special Collections Libraries (PACSCL)
  A consortium of 28 libraries whose collections total approximately 3,000,000 rare books, 200,000 linear feet of manuscripts and archival materials, and 9,000,000 photographs, maps, architectural drawings, and works of art on paper. Collections include national, regional, and local history; the natural and social sciences; world history, literature and religion; art and architecture; and business and industry. Formed in 1985. Site includes member library directory, map of member libraries, online public access catalogs, collections-at-a-glance, and links to special collections library resources.
  in Organizations with collections libraries organizations philadelphia special

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