1. Historical analysis of fluvial hydrosystems;Petts,1989
2. The quality of rivers, from pristine stage to global pollution;Meybeck;Palaeogeogr. Palaeoclim. Palaeoecol., (Glob. Plan. Change Sect.),1989
3. State of the Environment in the European Community;CEC,1987
4. Milieu en kwaliteit van het leven; kwaliteit van zoet oppervlaktewater, 1982–1986;CEC,1987
5. National policy document on water management;Dutch Ministry of Transport and Public Works,1989