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4
-
Great scientists : who changed the world with their inventions and discoveries / by Subhash G. Deo.
- 509.22 D418 2004
- Deo, Subhash G.
- Priority Publication,
- c2004.
- New Delhi :
-
Tell me the answer / by Indira Mukherjee.
- 032.02 M9537 1996
- Mukherjee, Indira.
- Bluebird Books,
- c1996-1998.
- New Delhi :
-
Beacon's junior encyclopedia.
- 032 B3657 2000
- Beacon Books ,
- 2000.
- New Delhi :
-
Inventors and discoverers / editorial Neeta Datta, Madhvi Kapur, Sharmistha Dash.
- 509.2 I622 1999
- Learners Press Private Limited,
- 1999.
- New Delhi :