International conference on science abstracting : convened by the United Nations Educational, Scientific, and Cultural Organization, in Paris, from 20 to 25 June 1949 : final report / UNESCO UNESCO Science QA11.A1 N38 502 UNI Unesco : United Nations; 1951. 1951. 1 Text Collection 194 p. ; eng engfre English and French. Teaching of basic sciences Teaching of basic sciences