American Philatelic Research Library
The American Philatelic Research Library (APRL), based in Bellefonte, Pennsylvania, is the largest public philatelic library in the United States. The library serves the needs of the members of the American Philatelic Society (APS) – with which it is closely affiliated and shares premises – and the public. It has more than 21,000 book titles and 5,700 journal titles. Its current building opened in 2016. Legal status. The library is a public library under Pennsylvania law and is registered with the United States Internal Revenue Service as a 501(c)(3) non-profit corporation. Donations are treated as a charitable  deduction for the purposes of United States federal income tax. Governance. The library is run by a nine-member Board of Trustees. Each member serves for six years. Three members are elected by the American Philatelic Society membership, three are appointed by the President of the APS and three are elected by the founders and patrons of the APRL. Magazine. The library publishes a quarterly magazine, the Philatelic Literature Review, which includes book reviews and other relevant content.