Er waren eens varkens... Author Meijler K. Date 1997 Source IUCN (ID: MON-061563) Publisher | Place of publication W.E.J. Tjeenk Willink | Zwolle, The Netherlands Pages 227; 1 p. Language Dutch Country/Territory Netherlands Subject Water, Wild species & ecosystems Keyword Hunting/capture Fertilizers/nutrients Freshwater quality/freshwater pollution