| Biological Aspects of Freshwater Pollution : Proceedings of the Course Held at the Joint Research Centre of the Commission of the European Communities, Ispra, Italy, 5-9 June 1978 |
| Biological Aspects of Freshwater Pollution : Proceedings of the Course Held at the Joint Research Centre of the Commission of the European Communities, Ispra, Italy, 5-9 June 1978 |