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3
-
Water and water resource management / ed. B. Datta Ray, R.P. Athparia.
- Omsons,
- 1999.
- New Delhi :
-
Assam : land and people / R. Gopalakrishnan.
- Omsons,
- 2000.
- New Delhi :
-
Meghalaya : land and people / R. Gopalakrishnan.
- Omsons,
- 1995.
- New Delhi :