| 21 | Collectivisation of rural settemets in Singer Region: A geographical study | |
| Researcher: | Obeid, Taha Hamadi | |
| Guide: | Rai, R K | |
| University: | Banaras Hindu University | |
| Language: | English | |
| 22 | Study of ionospheric drigts simultaneously at two different radio frequencies over low latitudes | |
| Researcher: | Janve, Anil V | |
| Guide: | Rai, R K | |
| University: | Mohanlal Sukhadia University | |
| Language: | English | |
| 23 | Studies of ionospheric drifts and irregularities at low latitudes | |
| Researcher: | Vinod Kumar | |
| Guide: | Rai, R K | |
| University: | Mohanlal Sukhadia University | |
| Language: | English | |
| 24 | Studies of ionospheric drift velocities and irregularities at different heights over low latitudes | |
| Researcher: | Sharma, Ram Vir | |
| Guide: | Rai, R K | |
| University: | Mohanlal Sukhadia University | |
| Language: | English | |
| 25 | Geo_environmental studies of the Khasi hills with special reference to landslides | |
| Researcher: | Chowdhury, Rajiv Kumar Dutta | |
| Guide: | Rai, R K | |
| University: | North-Eastern Hill University | |
| Language: | English | |
| Shodhganga | ||
| 26 | Geomorphology and rural settlements in Khasi and Jaintia Hills Meghalaya | |
| Researcher: | Panda, P C | |
| Guide: | Rai, R K | |
| University: | North-Eastern Hill University | |
| Language: | English | |
| Shodhganga | ||
| 27 | Geoiviurphology and agricultural development in Lunglei district Mizoram | |
| Researcher: | Rinawma, P | |
| Guide: | Rai, R K | |
| University: | North-Eastern Hill University | |
| Language: | English | |
| Shodhganga | ||
| 28 | ||
| Researcher: | Saikia, Haren | |
| Guide: | Rai, R K | |
| University: | North-Eastern Hill University | |
| Language: | English | |
| Shodhganga | ||
| 29 | ||
| Researcher: | Nongkhlaw, Dondor Giri | |
| Guide: | Rai, R K | |
| University: | North-Eastern Hill University | |
| Language: | English | |
| Shodhganga | ||
| 30 | Geo environmental impact assessment of coal mining in Lodna area of Jharia coalfield | |
| Researcher: | Sharma, Shree Kant | |
| Guide: | Rai, R K | |
| University: | North-Eastern Hill University | |
| Language: | English | |
| Shodhganga | ||
| 31 | ||
| Researcher: | Goel, Niranjan Prasad | |
| Guide: | Rai, R K | |
| University: | North-Eastern Hill University | |
| Language: | English | |
| Shodhganga | ||
| 32 | ||
| Researcher: | Boruah, Jayanta Kumar | |
| Guide: | Rai, R K | |
| University: | North-Eastern Hill University | |
| Language: | English | |
| Shodhganga | ||
| 33 | Geomorphology and environmental management of umiam basin, East Khasi hills, Meghalaya | |
| Researcher: | Agarwal, Mandira | |
| Guide: | Rai, R K | |
| University: | North-Eastern Hill University | |
| Language: | English | |
| Shodhganga | ||
| 34 | ||
| Researcher: | Cajee, Laitpharlang | |
| Guide: | Rai, R K | |
| University: | North-Eastern Hill University | |
| Language: | English | |
| Shodhganga | ||