000			00274nam a2200121Ia 4500
100			_aHarris ,Dale B (ed,)
942			_cBK
654			_a
245			_aConcept of Development
260			_aMinneapolis _bUniversity of minnesota _c1957
082			_a155
300			_bHb _ax,287
999			_c357661 _d357661
041			_aeng