000 00450cam a22001217a 4500
008 180718b1967 xxu||||| |||| 00| 0 eng d
082 _aP64 Un3t
100 _aErdos, Renee F.
245 _aTeaching by correspondence: a study undertaken by Renee F. Erdos Head of the school of external studies Sydney technical college, Australia on behalf of Unesco
_cby Renee F. Erdos
260 _aParis
_bUnesco
_c1967
300 _a218p.
700 _aFrance, Unesco
999 _c494989
_d494989