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Welch, Susan, 340.942-W441u-안진홍
| Thomson/Wadsworth |
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340.942-W441u-안진홍,
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Sigelman, Lee, 334.942-S574b
| Cambridge University Press |
1991
334.942-S574b,
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Welch, Marshall, 379.6-W441e
| Harcourt Brace College Publishers |
1995
379.6-W441e,
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