00298nam a2200109Ia 450000500170000000800410001708200160005810000180007424500480009226000400014030000080018020260205052051.0260111s9999||||xx |||||||||||||| ||und||  a300.7 V443E  aVashist, S.R. 0aEncyclopaedia of teaching of social studies  aNew DelhibAnmol Publicationsc1993  a5V.