000 003390000a22001330004500
008 140223b1970 xxu||||| |||| 00| 0 eng d
041 _aEng
080 _aTb4 L0
082 _aTb4 L0
100 _aMouly George J.
245 _aScience of educational research, Edn.2.
260 _aNew York
_bVan Nostrand
_c1970
650 _aEducation
999 _c81973
_d81973