Stamps
- 221
- Art on Stamps
- Multilingual site dedicated to visual arts as depicted on stamps. It includes a database, an art gallery, museum exhibits and a free Internet club
- 223
- Bridges in Paintings on Stamps
- A speciality site of Bridges appearing in Paintings featured on Stamps. Stamps of almost a hundred artists indexed.
- 224
- Hundertwasser Stamp Resource
- Information on all aspects of collecting stamps and philatelic items concerning the Austrian artist Friedensreich Hundertwasser.
- 227
- Atlas of Ophthalmic Philately
- Stamps related to eye donation, braille, ophthalmology congresses and eye diseases, famous ophthalmologists and blind people.
- 230
- Australian Flora on Postage Stamps Home Page
- Information and illustrations of all Australian postage stamps depicting Australian flora. Site by the Australian National Botanical Gardens
- 237
- Federal Duck Stamp Program
- Federal Migratory Bird Hunting and Conservation Stamps, commonly known as “Ducks Stamps,” are pictorial stamps produced by the U.S. Postal Service for the U.S. Fish and Wildlife Service. They are not valid for postage