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Popp, D., | American Economic Assn | 2002 ,
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디지털 모어, 674-디'78오-DVD | 썬미디어 | 2005 674-디'78오-DVD,
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popp, James A, 513.36-P831m | Hemisphere publishing | 1984 513.36-P831m,
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Popper, Karl R, 114.1-P831k | Routledge | 1994 114.1-P831k,
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Popper, Robert, 364.153-P831p | West Publishing | 1978 364.153-P831p,