00340nam a2200121 a 450000500170000000800410001702000150005804100080007310000190008124500510010026400560015130000110020720260716125150.0260701s1997    ii            000 0 eng d  a8171814689  aeng1 aGhai, Shuchita10aGreat scientific inventions /cGhai, Shuchita. 1aNew Delhi :bLearners Press Private Limited,c1997.  a193 p.