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Copeland, L. O., 523.22-C782p | Burgess | 1985 523.22-C782p,
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Copeland, B.R., | American Economic Assn | 2009 ,
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Copeland, John G., 770-C782c-안진홍 | Holt, Rinehart, and Winston:Harcourt Brace College Publishers | 1997 770-C782c-안진홍,
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Bickman, Leonard, 331-B583a | Sage | 1993 331-B583a,
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Copeland, Thomas E., 325.8-C782f | Harcourt | 1983 325.8-C782f,