Bird Study Vol 20 N°3 September 1973 : The Journal Of The British Trust For Ornithology. Sommaire : Wintering Sea-Ducks Off The East Coast Of Scotland - Foods Of The Oystercactcher In Morecambe Bay -(...)
Bird Study Vol 20 N°4 December 1973 : The Journal Of The British Trust For Ornithology. Sommaire : Egg Breakage And Breeding Failure In British Merlins - The Wintering Population Of Ruffs In Britain(...)
Bird Study Vol 16 N°1 March 1969 : The Journal Of The British Trust For Ornithology. Sommaire : The Subspecies Concept - Behaviour Of Gulls Robbing Eiders - Wing Formula Of Willow Warbler And(...)
Bird Study Vol 16 N°3 September 1969 : The Journal Of The British Trust For Ornithology. Sommaire : A Study Of A Greenfinch Roost - The Moult Of British Blue Tit And Great Tit Populations -(...)
Bird Study Vol 20 N°1 March 1973 : The Journal Of The British Trust For Ornithology. Sommaire : Success Of Sparrowhawks In An Area Of Pesticide Usage - Wader Populations Of Morecambe Bay - Moult Of(...)
Bird Study Vol 16 N°4 December 1969 : The Journal Of The British Trust For Ornithology. Sommaire : The Numbers Of Bird Species On Islands - The Use Of Annual Ringing And Nest Record Card Totals As(...)
Bird Study Vol 19 N°3 September 1972 : The Journal Of The British Trust For Ornithology. Sommaire : The Peregrine Population Of Great Britain In 1971 - Brereding Bird Species Diversity In Relation To(...)
Bird Study Vol 21 N°1 March 1974 : The Journal Of The British Trust For Ornithology. Sommaire :Where Have All Whitethroats Gone ? - Mouls Seasons Of The British Corvidae - Breeding Statistics And(...)
Bird Study Vol 16 N°2 June 1969 : The Journal Of The British Trust For Ornithology. Sommaire : Seasonal Fluctuations Of A Bird Population On The Coast Of The Var France - Spring Migration Of The(...)
Bird Study Vol 18 N° 1 March 1971 : The Journal Of The British Trust For Ornithology. Sommaire : Bird Population Changes On Farmalnd And In Woodland For The Years 1968-69 - Habitat Requirements Of The(...)
Bird Study Vol 18 N°4 1971 : The Journal Of The British Trust For Ornithology. Sommaire : Some Foods Taken By Waders In Morecambe Bay - The Breeding Bird Communauties Of Lancashire Satmarshes - Bird(...)
Bird Study Vol 20 N° 2 June 1973 : The Journal Of The British Trust For Ornithology. Sommaire : Species Extinction In Birds - The Red-Bacjed Shrike : A Vanishing British Species - Bird Populations Of(...)
Bird Study Vol 18 N°2 June 1971 : The Journal Of The British Trust For Ornithology. Sommaire : Age Of First Breeding And Adult Survival Rates In The Swift - Notes On Oenanthe Species In Winter In(...)
