| Avaa | Gopal, Brij toim. Wetzel, Robert G. toim.
| Limnology in developing countries, Volume 1 | | kirja | kehitysmaat, limnologia | SIL Internationel Scientific Publications | New Delhi, India | 1995 | 230 | 81-86047-14-X | | In the Fish Library two items | H-Limnologia |
| Avaa | Gopal, Brij toim. Wetzel, Robert G. toim.
| Limnology in developing countries, Volume 4 | linkki | kirja | kehitysmaat, limnologia | SIL Internationel Scientific Publications | New Delhi, India | 2004 | 244 | 81-86047-23-9 | | | H-Limnologia |
| Avaa | Wetzel, Robert G. toim. Gopal, Brij toim.
| Limnology in developing countries, Volume 2 | | kirja | kehitysmaat, limnologia | SIL Internationel Scientific Publications | New Delhi, India | 1999 | 330 | 81-86047-19-0 | | In the Fish Library three item... | H-Limnologia |
| Avaa | Wetzel, Robert G. toim. Gopal, Brij toim.
| Limnology in developing countries, Volume 3 | | kirja | kehitysmaat, limnologia | SIL Internationel Scientific Publications | New Delhi, India | 2001 | 189 | 81-86047-21-2 | | In the Fish Library two items | H-Limnologia |