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.collectors-mall.com/philib/RMPL.htm

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

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/special/wprl.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

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/

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

American Philatelic Research Library

The largest public philatelic library in the United States, with many of philately's classic periodicals, catalogs, government documents, auction catalogs, and a variety of other materials.
http://www.stamps.org/TheLibrary/lib_AbouttheAPRL.htm

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/08/0806_e.html