Teaching by correspondence:
Erdos, Renâee F.
Teaching by correspondence: a study undertaken by Renâee F. Erdos on behalf of Unesco. - London, Paris, Paris, Paris, Paris, Longmans; Unesco, Unesco, Unesco, Unesco, 1967. - iii-xvii, 218 p. illus. (incl. forms.) maps, facsims., tables, di agrs. 23 cm.
Bibliography: p. 213-214.
68-071024
Correspondence schools and courses.--------
Teaching by correspondence: a study undertaken by Renâee F. Erdos on behalf of Unesco. - London, Paris, Paris, Paris, Paris, Longmans; Unesco, Unesco, Unesco, Unesco, 1967. - iii-xvii, 218 p. illus. (incl. forms.) maps, facsims., tables, di agrs. 23 cm.
Bibliography: p. 213-214.
68-071024
Correspondence schools and courses.--------