00286nam a2200121Ia 4500008004100000040001600041041001200057082001500069100001900084245001900103260002500122300001700147230917s9999||||xx |||||||||||||| ||und||  e22605aMAIN  aEnglish  a512.7 S19N  aShanti Narayan 0aNumber systems  aDelhibS Chandc1966  aviii, 128 p.