- American Philatelic Research Library (APRL), 100 Match Factory Place, Bellefonte, PA 16823, USA
- American Air Mail Society (AAMS) (USA)
- American Philatelic Society (APS) (USA)
- Collectors Club of New York (CCNY) (USA)
- Stamp Smarter Philatelic Learning Center
- Collectors Club of Chicago Library, 1029 N. Dearborn Street, Chicago, IL 60610-2803
- Collectors Club of New York Library, 22 East 35th Street, New York,NY 10016
- National Postal Museum Library, National Postal Museum, 2 Massachusetts Ave. N.E., Washington, DC 20013-7012
- Rocky Mountain Philatelic Library (RMPL), 2038 S. Pontiac Way, Denver, CO 80224
- Western Philatelic Library, 3004 Spring Street, Redwood City, California, 94063
- Colorado Postal History Society
- Dakota Postal History Society
- Empire State Postal History Society
- Georgia Postal History Society
- Michigan Postal History Society
- New Jersey Postal History Society
- Pacific Northwest Postal History Society
- Pennsylvania Postal History Society
- U.S. Philatelic Classics Society
- Machine Cancel Society
- The Precancel Society
- https://www.upss.org/ United Postal Stationery Society
