00261nam a2200085Ia 4500082001700000100002400017245006200041260006200103300001000165  aRR 016.5 HIN  aChaddha, Yograj ed. 0aHindi vigyanik aur tachniki parkashan nidashika 1966-1980  aNew DelhibVaigyanik Avom Audyogik Anusandhan Parisc1983  a336p.