1. The impact of anglers on willife and site amenity;Bell,1984
2. How the fishermen kill the swans;Birkhead;New Scient.,1981
3. Population regulation in the mallard (Anas platyrhynchos);Hill;J. Anim. Ecol.,1984
4. Lead poisoning in swans;Hunt;Brit. Trust. Orn. News,1977
5. Angling in South Wales;Mawle,1983