00672nam a2200205Ia 450000100060000000300050000600500170001100800410002801000150006901500140008405000160009808200150011410000290012924500500015826000430020830000760025149000630032750400300039065000460042020812BIBL20160527194319.0680301s1967    enkabhk  b    00010 eng    a 68071024   aB67-211200 aLC5915b.E7  a370.7/1/5410aErdos, Renée F.2Local10aTeaching by correspondencecRenée F. Erdos.0 aLondonbLongmansaParisbUnescoc1967.  aiii-xvii, 218 p.billus. (incl. forms.) maps, facsims., tables, diagrs.0 aUnesco source books on curricula and methods, no. 32Local  aBibliography: p. 213-214. 0aCorrespondence schools and courses2Local