Medicine

Anti-Smoking on Stamps
A Topical site on a major world issue
http://www.trussel.com/stamps/smoking/mini/mini.htm

Atlas of Ophthalmic Philately
Stamps related to eye donation, braille, ophthalmology congresses and eye diseases, famous ophthalmologists and blind people.
http://www.mrcophth.com/ophthalmologyonstamps/mainpage.html

Dentistry and stamps - Thématique Dentaire
How dentistry is seen through stamps.
http://timbreetdent.free.fr

Malaria on Stamps Collection
Displays philatelic material that publicized efforts to eradicate mosquito-bourne illness.
http://www.malariastamps.com/

Radiology on Stamps
A Philatelic History of Radiology
http://radiographics.rsnajnls.org/cgi/reprint/8/5/981.pdf#search=%22radiology%20on%20stamps%22