The Earth’s Physical Features Study Unit is an affiliate of the American Topical Association. The Earth's Physical Features Study Unit  promotes the study and enjoyment of Earth topics as they appear on stamps, postcards, cancels and other related materials.

We collect philatelic items and publish articles on such features as:

WATERFALLS    VOLCANOES     MOUNTAINS     EARTHQUAKES     RIVERS

MINERALS          CAVES               LAKES             LANDSCAPES        GEOLOGY 

GEOLOGISTS     FOSSILS            HOT SPRINGS     METEOROLOGY