000			00271nam a2200121Ia 4500
100			_aLanger, Jonas.
942			_cBK
654			_a
245			_aTheories of development
260			_aNew York _bHolt, Rinehart and Winston _c1969
082			_a155
300			_bHb _axi, 191
999			_c393951 _d393951
041			_aeng