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Multilingual
1
Enger, Eldon D., 472-E57c | Wm. C. Brown Publishers | 1994 472-E57c,
2
엔거, 엘돈 D., 470-엔14사 | 한국맥그로힐 | 2005 470-엔14사,
3
Enger, Eldon D., 539.9-E57e-안진홍 | W.C. Brown | 1989 539.9-E57e-안진홍,