| 1 | ||
| Researcher: | Grewal, Jagdev Singh | |
| University: | Panjab University | |
| Language: | English | |
| Shodhganga | ||
| 2 | ||
| Researcher: | Ishwar Das | |
| University: | Panjab University | |
| Language: | English | |
| Shodhganga | ||
| 3 | Studies on the fixation of atmospheric nitrogen by cultivated leguminous crops of india | |
| Researcher: | Sen, Arindranath | |
| University: | Panjab University | |
| Language: | English | |