00333nam a2200121Ia 450000500170000000800410001708200120005810000200007024500530009026000340014330000090017765000250018620240821151416.0240821s9999||||xx |||||||||||||| ||und||  a372 HAM  aHamburg, Morris 0aCase studies in elementary school administration  aNew YorkbColumbia Univc1957  a114p  aElementary education