LEADER 00454cam a1100157 k 4500 001 20170300000001351 005 20170324164004 008 030401s1975 ulk 000a kor 085 $a75-3-33 090 $6093-01$a75-043 093 0 $6090-01$aUM0000001418$xU$y01 245 $a북한의 과학기술 연구$d鄭基鎬 저. 260 $a서울:$b국토통일원$c1975. 300 $a55p 506 $a일반 856 4 $ahttps://lib.uniedu.go.kr/libeka/elec/00063830.pdf