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Generalized regional geologic map emphasizing the location

By California Volcano Observatory 2010 (approx.)
Generalized regional geologic map emphasizing the location, extent, and ages of large volcanic centers including those in Lassen
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Detailed Description

Generalized regional geologic map emphasizing the location, extent, and ages of large volcanic centers including those in Lassen Volcanic National Park and vicinity, California.

Sources/Usage

Public Domain.