00281nam a2200097Ia 4500008004100000082001400041100002600055245006000081260003400141300000800175190709s9999    xx            000 0 und d  a371 Sw31S  aSwearingen, Mildred E 0aSupervision of instruction : foundations and dimensions  aBostonbAllyn and Baconc1962  a312