Published in Bulletin of The British Ornithologists' Club, in 1971, in volume 91, pages 46-49
Published in Bulletin of The British Ornithologists' Club, in 1971, in volume 91, pages 1-7
Published in Bulletin of The British Ornithologists' Club, in 1971, in volume 91, pages 8-9
Published in Bulletin of The British Ornithologists' Club, in 1971, in volume 91, pages 9-10
Published in Bulletin of The British Ornithologists' Club, in 1971, in volume 91, pages 10-11
Published in Bulletin of The British Ornithologists' Club, in 1971, in volume 91, pages 11-12
Published in Bulletin of The British Ornithologists' Club, in 1971, in volume 91, pages 12-14
Published in Bulletin of The British Ornithologists' Club, in 1971, in volume 91, pages 14-18
Published in Bulletin of The British Ornithologists' Club, in 1971, in volume 91, pages 18
Published in Bulletin of The British Ornithologists' Club, in 1971, in volume 91, pages 19-20
Published in Bulletin of The British Ornithologists' Club, in 1971, in volume 91, pages 20-21
Published in Bulletin of The British Ornithologists' Club, in 1971, in volume 91, pages 21-25
Published in Bulletin of The British Ornithologists' Club, in 1971, in volume 91, pages 25-28
Published in Bulletin of The British Ornithologists' Club, in 1971, in volume 91, pages 28-32
Published in Bulletin of The British Ornithologists' Club, in 1971, in volume 91, pages 32
Published in Bulletin of The British Ornithologists' Club, in 1971, in volume 91, pages 36-39
Published in Bulletin of The British Ornithologists' Club, in 1971, in volume 91, pages 41
Published in Bulletin of The British Ornithologists' Club, in 1971, in volume 91, pages 56-60
Published in Bulletin of The British Ornithologists' Club, in 1971, in volume 91, pages 61-64
Published in Bulletin of The British Ornithologists' Club, in 1971, in volume 91, pages 64-65
Published in Bulletin of The British Ornithologists' Club, in 1971, in volume 91, pages 66-76
Published in Bulletin of The British Ornithologists' Club, in 1971, in volume 91, pages 76-79
Published in Bulletin of The British Ornithologists' Club, in 1971, in volume 91, pages 79-81
Published in Bulletin of The British Ornithologists' Club, in 1971, in volume 91, pages 81-84
Published in Bulletin of The British Ornithologists' Club, in 1971, in volume 91, pages 88
Published in Bulletin of The British Ornithologists' Club, in 1971, in volume 91, pages 90-92
Published in Bulletin of The British Ornithologists' Club, in 1971, in volume 91, pages 92-93
Published in Bulletin of The British Ornithologists' Club, in 1971, in volume 91, pages 93-94
Published in Bulletin of The British Ornithologists' Club, in 1971, in volume 91, pages 94-95
Published in Bulletin of The British Ornithologists' Club, in 1971, in volume 91, pages 95
Published in Bulletin of the British Ornithologists' Club, in 1971, in volume 91, issue 4, pages 96-98
Published in Bulletin of The British Ornithologists' Club, in 1971, in volume 91, pages 98-99
Published in Bulletin of The British Ornithologists' Club, in 1971, in volume 91, pages 99-103
Published in Bulletin of The British Ornithologists' Club, in 1971, in volume 91, pages 103-107
Published in Bulletin of The British Ornithologists' Club, in 1971, in volume 91, pages 108-109
Published in Bulletin of The British Ornithologists' Club, in 1971, in volume 91, pages 110-111
Published in Bulletin of The British Ornithologists' Club, in 1971, in volume 91, pages 111-113
Published in Bulletin of The British Ornithologists' Club, in 1971, in volume 91, pages 113-116
Published in Bulletin of The British Ornithologists' Club, in 1971, in volume 91, pages 117-119
Published in Bulletin of The British Ornithologists' Club, in 1971, in volume 91, pages 121-125
Published in Bulletin of The British Ornithologists' Club, in 1971, in volume 91, pages 125-126
Published in Bulletin of The British Ornithologists' Club, in 1971, in volume 91, pages 126-131
Published in Bulletin of The British Ornithologists' Club, in 1971, in volume 91, pages 131-133
Published in Bulletin of The British Ornithologists' Club, in 1971, in volume 91, pages 134-135
Published in Bulletin of The British Ornithologists' Club, in 1971, in volume 91, pages 137-144