A short excursion through the subject of stamps bearing geological themes gives an impression about this attractive field of collection.

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Grondboor & Hamer

CC BY 3.0 NL ("Naamsvermelding")

Nederlandse Geologische Vereniging

D. Sluyk, & W.F. Steenken. (1967). Geologie in miniatuur (Geologische motieven op postzegels). Grondboor & Hamer, 21(2), 41–51.