TY  - BOOK
AU  - Erdos,Renée F.
TI  - Teaching by correspondence
T2  - Unesco source books on curricula and methods, no. 3
AV  - LC5915 .E7
U1  - 370.7/1/54 
PY  - 1967///
CY  - London, Paris
PB  - Longmans, Unesco
KW  - Correspondence schools and courses
KW  - Local
N1  - Bibliography: p. 213-214
ER  -