Postage stamp collecting

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Rutkowski, Jerzy H. - Physics in Philately
Science stamp collectors page that collects philatelic items with physics as a theme

Zwetchkenbaum, Sam - Scientists on the Stamps of Israel
A section of a science stamp collectors site of Israeli stamp issues, specifically with scientists

Dobrescu, Dan - Philatelica
A science stamp collectors site that has classic Romanian stamps, computer-themed stamps, the space station Salyut 6, Romanian scientists, Dumitru Dorin Prunariu (the first Romanian cosmonaut), and cancellations made with a Daguin machine

Soppe, Richard - Personal website
science stamp collectors site that is collecting airplanes stamps, dams stamps, explorers stamps, scientists stamps, and Netherland postage stamps

Reinhardt, Joachim - Physicists on Stamps
Science stamp collectors page with a large online gallery of stamps with scientists who are involved in the field of physics

Naylor, Maiken - Sci-Philately
A Science stamp collectors site with an informative online gallery of science-themed stamps