Stamps
- 245
- Paleophilatelie
- Provides checklists of stamps picturing dinosaurs and other prehistoric animals, along with paleontologists and anthropologists.
- 246
- Philatelic Mineralogy
- Images of stamps picturing gems, rocks, and minerals can be browsed by issuing country or mineral name.
- 250
- Sobralia & Stanhopea Orchids on Stamps
- A complete listing of all known Stanhopea and Sobralia orchids on stamps, with photos.
- 251
- South African Birds on Stamps
- Stamps featuring Southern African Birds, particularly those birds that appear in "Roberts Birds of Southern Africa".
- 252
- Stamped Out
- Prehistoric life forms and fossils on stamps, indexed by species with catalogue numbers
- 253
- Sylvestre Buoro's Rhino-Stamps Collection
- Presents postal issues and related material picturing the rhinoceros, plus unrelated issues from several Central Asian countries.
- 254
- The Illustrated Catalogue of Dinosaur Stamps
- An illustrated catalogue of postal stamps featuring dinosaurs.
- 255
- Theme Birds on Stamps
- Information related to collecting birds on stamps. Presenting BirdStamps - the complete listing of whole world bird stamps issues.
- 257
- Waterfall Postage stamps of the world
- Dedicated to the waterfall stamp collectors. Check list of stamps on Waterfall, waterfall stamp information, Waterfall stamp resources, and general information on waterfalls.
- 258
- Detective Fiction on Stamps
- Sherlock Holmes, and Inspector Maigret on philatelic issues from around the world.