TY  - BOOK
T1  - A study of the possibilities of graphs as a means of instruction in the first four grades of the elementary school
A1  - Strickland, Ruth Gertrude
PP  - New York
PB  - Columbia University
YR  - 1938
UL  - http://vufind10-pruebas.sigbunlp.bibliotecas.unlp.edu.ar/Record/dun.65368
OP  - 173
ER  -