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1
Powers, John H., 580.427-P888c | McGraw-Hill Book Company | 1987 580.427-P888c,
2
Powers, Thomas F., 591.9-P888h | John Wiley and Sons | 1988 591.9-P888h,
3
Powers, Thomas F, 591.9-P888i | John Wiley and Sons | 1988 591.9-P888i,