American Philatelic Society
   The largest public philatelic library in the United States, Its holdings include catalogues, government documents, auction catalogues, and a variety of other materials. Located in State College, Pennsylvania.
   http://www.stamplibrary.org/

National Philatelic Society Library (NPSL)
   A library with 1750 linear feet of shelving covering all aspects of stamp collecting from 1865 to date. It is very strong on periodicals of the world.
   http://www.ukphilately.org.uk/nps/library/library.htm

Rocky Mountain Philatelic Library
   Houses over 5000 books on philately, issues of periodicals, auction catalogs for research purposes, a western history (postal history) and railroad collection, post office publications dating back to 1876, a collection of maps dating back to the 1870's, a
   http://www.rockymountainphilateliclibrary.com/

The British Library's Philatelic Collections
   A collection of stamps, postal history and books, including the Tapling Collection. Over eight million items. The collections, together with philatelic books, photographs, general reference material, maps, newspapers and of
   http://www.bl.uk/collections/stamps.html

The Canadian Postal Archives
   Provides an overview of the philatelic collections preserved by the National Archives of Canada. Includes information about every postage stamp issued by Canada and British North America since 1851.
   http://www.collectionscanada.ca/philately-postal/index-e.html

The Wineburgh Library
   Philatelic research library at the University of Texas (Dallas) with books, periodical volumes, philatelic journals and a selection of post office publications and reports.
   http://www.utdallas.edu/library/collections/speccoll/wprl/wprl.htm

Western Philatelic Library
   Located in Sunnyvale, California, the library has over 8,000 philatelic books and monographs available for public examination.
   http://www.pbbooks.com/wpl.htm