Postage stamp collecting

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Wagner, Michel - Of Bridges and Stamps
A architecture stamp collectors page about bridges on stamps

Rodriguez, Angel Gonzalez - Los Puentes en la Filatelia
Architecture stamp collectors site in Spanish language of a collector of bridges on stamps

Johansen, Odd - Bridges & Philately
An architecture stamp collectors page of bridges on stamps, with a section on Norwegian bridges in particular

Soppe, Richard - Personal website
Architecture stamp collectors site that collects topical stamps with airplanes, dams, explorers, scientists, and the Netherlands