000 00326nam a2200133Ia 4500
008 231017s9999 xx 000 0 und d
082 _a370.152NRC
082 _bNRC
245 0 _aLearning to think spatially
245 0 _cNational Research Council
260 _bNational Research Council
300 _c30cm
942 _cREP
999 _c605058
_d605058