Water Supply and Irrigation Papers of the United States Geological Survey . A. GROUP OF ACTIVE MUD VOLCANOES WEST OF IMPERIAL II. GENERAL VIEW OF QUIESCENT MUD VOLCANOES NEAR IMPERIAL JUNCTION. ORIGIN OF UNDERGROUND WATERS. 33 basin, where their source may usually be recognized in a near-by can-yon. South of Salton Sink, where the original lake was larger andthe material with which it was filled was supplied more directly FEET 0- 100 — 200- 300- 400- 500 —

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