000 00682nam a2200181Ia 4500
008 160601s9999 xx 000 0 und d
100 _aNational Society for the Study of Education, Chicago USA
_911176
100 _aWitty,PAul.A
_911263
245 _aEducationally Retarded and Disadvantaged
245 _bSixty Sixth Yearbook of the National Society for the Study of Education
260 _aChicago
260 _bNational Society for the Study of Education
260 _c1967
300 _axiii, 384p.
440 _aNational Society for the Study of Education Yearbook
_911178
650 _aMental Retardation - Education
_911264
650 _aSpecial Education - Yearbook
_911265
999 _c3612
_d3612