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Multilingual
1
National Geographic Society, 662-N277포 | 청어람미디어 | 2007 662-N277포,
2
Lewicki, Roy I., 339.45-L671r | JAI Press | 1986 339.45-L671r,
3
Sheppard, Joseph, 654.5-S549d | Watson-guptill publications | 1984 654.5-S549d,
4
Lewicki, Roy I., 339.45-L671r-V.1 | JAI Press | 1986 339.45-L671r-V.1,