00000nz  a2200000n  4500
001  KSH2002009062
005  20030101000000
008  020323 n azknn|abn          |a a|a    | 
150  ▼a협곡 침식[峽谷浸蝕]▲
550  ▼wg▼a침식 작용[浸蝕作用]▲