U.S. Geological Survey Photographic Library

ID. King, 56

Mud volcano on Lassen Peak in California. Photo by T.H. O'Sullivan.U.S. Geological Exploration of the Fortieth Parallel (King Survey).

Mud volcano on Lassen Peak in California. Photo by T.H. O'Sullivan.U.S. Geological Exploration of the Fortieth Parallel (King Survey).

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