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Roger Clarke,, | Blackwell Publishing | 2003 ,
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Clark, Roger E., 325.4-C594c | Prentice Hall | 1986 325.4-C594c,
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Clark, Roger, 741-C594s | IRWIN | 1987 741-C594s,
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Clark, Roger H, 542.1-C592거 | 보원 | 1994 542.1-C592거,