» 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 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

» 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