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Ehrlich, I., | American Economic Assn | 2010 ,
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Torres, Hazel O., 515.1-T693m-안진홍 | Saunders | 1980 515.1-T693m-안진홍,
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Ehrlich,Paul R, 472.5-E33s-안진홍 | Macmillan | 1987 472.5-E33s-안진홍,
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Ehrlich , Paul R., 472.01-E33b | McGraw-Hill | 1976 472.01-E33b,
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