00260nam a2200097Ia 4500008004100000082001400041100001800055245003800073260004300111300000800154190709s9999    xx            000 0 und d  a370.1 R1G  aRoss, James S 0aGround work of educational theory  aLondonbGeorge G Harrap & Comapnc1962  a264