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The picture above is a portrait of many square miles of the Earth's surface. The purpose of this leaflet is to explain how this portrait was made, how it can tell us about what lies beneath the surface of the ground, and other ways in which it can be useful to mankind.
Suggested Citation
White, W., 1992, Geologic maps : Portraits of the Earth: General Information Product, 19 p., https://doi.org/10.3133/70039220.