000  $anz n  2
000  $a주제어
001  $aKSH1998041409
005  $a20021225000000
008  $a980429 n azknnaabn          |a a|a    | 
150  $a하천학[河川學]
550  $wg$a육수학[陸水學]
550  $a하천[河川]