TY  - BOOK
T1  - A comparative study of the progess of subnormal pupils in the grades and in special classes
A1  - Pertsch, C.
PP  - New York
PB  - Columbia University
YR  - 1936
UL  - http://vufind10-pruebas.sigbunlp.bibliotecas.unlp.edu.ar/Record/dun.49936
OP  - 101
ER  -