00000nz  a2200000n  4500
001  KSH1997000294
005  19970428105451
008  970428 n azknn|abn          |a a|a    | 
150  ▼a단구 구성층[段丘構成層]▲
450  ▼wr▼i영어▼aterrace forming strata▲
550  ▼wg▼a퇴적층[堆積層]▲
550  ▼a단구(지형)[段丘]▲