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Environmental geology

By Keller, Edward A.. Columbus Charles E. Merrill Pub. 1979 . xii, 548 p. 26 cm.. 0675082964

By Keller, Edward A.. Columbus Charles E. Merrill Pub. 1982 . xii, 526 p. 26 cm.. 0675099153

By Botkin, Daniel B.. Columbus Charles E. Merrill Publishing 1982 . ix,506p. 0675098130

By Botkin, Daniel B.. London Charles E Merrill 1982 . ix, 506 p. 29 cm.. 0675098130