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Dahl, Robert A., 340-D131m | Prentice-Hill | 1984 340-D131m,
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Dahl, Robert A., 340.942-D131w | Yale University Press | 1981 340.942-D131w,
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Dahl, Osten., 701.5-D131t | Basil Blackwell | 1985 701.5-D131t,
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Dahl, Robert A, 301.2-D131s | Stanford University Press | 1973 301.2-D131s,