TY  - BOOK
AU  - Erdos,Renee F.
TI  - Teaching by correspondence
T2  - Unesco Source Book
U1  - 371.356 
CY  - London UK: 
PB  - Longmans
KW  - Correspondence schools and courses
KW  - Distance education - Aims and objectives
KW  - Distance education - Philosophy
KW  - Distance education - Study and teaching
ER  -