000 00284nam a22001217a 4500
999 _c66276
_d66276
005 20210115105201.0
008 210114b ||||| |||| 00| 0 eng d
082 _a520 S531S
245 _aSpherical Trigonometry
650 _bStellar Astronomy
650 _bSolar System
942 _cSW