00322nam a22000977a 4500082001500000100002100015245006900036260004500105300004500150650002900195  a370.15 ELL  aEllis, Robert S.  aEducational psychology : ba problem approach /cRobert S. Ellis  aPrinceton, N.J : bVan Nostrand, c1965.  axi, 546 pagesb : illustrations ; 24 cm.  a Educational psychology.