Θέμα: Υδρόβια πουλιά
- Atlas of anatidae populations in Africa and Western Eurasia
- African waterfowl census 1996
- Results from the International Waterbird Census in the Western Palearctic and Southwest Asia 1995 and 1996
- Waterfowl population estimates
- Manual for aeroplane and ship surveys of waterfowl and seabirds
- Waterfowl population estimates
Θέμα: Πληθυσμοί
Συγγραφέας: The Netherlands. Ministry of Agriculture. Nature Management and Fisheries
- Atlas of anatidae populations in Africa and Western Eurasia
- African waterfowl census 1996
- Results from the International Waterbird Census in the Western Palearctic and Southwest Asia 1995 and 1996
- Waterfowl population estimates
- Waterfowl population estimates
- Western palearctic and South-West Asia waterfowl census 1994