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ASH-FLOW TUFFS: THEIR ORIGIN, GEOLOGIC RELATIONS AND IDENTIFICATION AND ZONES AND ZONAL VARIATIONS IN WELDED ASH FLOWS
Ross, C. S., and Smith, R. L., 1980, Ash-flow tuffs: their origin, geologic relations and identification and zones and zonal variations in welded ash flows: New Mexico Geological Society Special Publication 0009, variously paginated.