000 00284nam a2200121Ia 4500
100 _aHavigburst, Robert J.
942 _cBK
654 _a
245 _aDevelopmental tasks and education
260 _aNew York
_bDavid McKay Company
_c1948
082 _a155.42
300 _bHb
_avii,100
999 _c360916
_d360916
041 _aeng