Stamp celebrates SA geology

This Day in History - Earth Day Stamps

Promoting geological heritage through postage stamps - Dove - 2016 - Geology Today - Wiley Online Library

War Tax Stamps:The British Empire's Effort (1914-1920) - Philatelic Database

Lyell, Charles. 1830. Principles of geology, being an attempt to explain the former changes of the Earth's surface, by reference to causes now in operation. London: John Murray. Volume 1.

Show Us Geology On Stamps. Geologic Formations, Etc - Page 2 - Stamp Community Forum

Stamps with the theme Nelson Mandela - PostBeeld - Online Stamp Shop - Collecting

Show Us Geology On Stamps. Geologic Formations, Etc - Page 2 - Stamp Community Forum

534 Nelson Mandela Prison Images, Stock Photos, 3D objects, & Vectors

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The Evolutionary Road