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Inventors and discoverers / editorial Neeta Datta, Madhvi Kapur, Sharmistha Dash.
- 509.2 I622 1999
- Learners Press Private Limited,
- 1999.
- New Delhi :
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Infinity's Encyclopaedia of Science Projects.
- 621.3403 I432 2000
- Rajeev Sethi Infinity Books,
- 2000.
- New Delhi :