000 00289nam a2200121Ia 4500
008 250224s9999 xx 000 0 und d
020 _a435800620
082 _a371.144MAR
100 _aMarriott Grace
245 0 _aObserving teachers at work
260 _bHeinemann
_c2001
942 _cBK
999 _c437144
_d437144