00621na  a2200181   4500001001300000005001500013008004100028024002700069100002700096370004800123372005300171374004800224375001100272377001100283400003300294670006000327670005200387KAC20090399920221027105352090724 b aznnnaabn           a aaa      7 a000000005046834X2isni1 aBaker, William,d1953-  c미국(국명)[美國]0KSH19980227002nlsh  a수학 교육[數學敎育]0KSH19980181642nlsh  a작가(사람)[作家]0KSH19980134622nlsh  a남성  l영어1 a베이커, 윌리엄,d1953-  a디스커버리 수학 , (북이십일 아울북), 2008  a가상국제전거파일(VIAF)uhttp://viaf.org