000  $anz n  2
000  $a주제어
001  $aKSH1999019592
005  $a19990629184347
008  $a990629 n azknnaabn          |a a|a    | 
150  $a대기 혼탁도[大氣混濁度]
450  $wr$i영어$aatmospheric turbidity
550  $a네뷸[nebule]
550  $a대기(공기)[大氣]
550  $a시정(척도)[視程]