Published in Bulletin of The British Ornithologists' Club, in 1957, in volume 77, pages 26-29
Published in Bulletin of The British Ornithologists' Club, in 1957, in volume 77, pages 49-52
Published in Bulletin of The British Ornithologists' Club, in 1957, in volume 77, pages 58-60
Published in Bulletin of The British Ornithologists' Club, in 1957, in volume 77, pages 24-25
Published in Bulletin of The British Ornithologists' Club, in 1957, in volume 77, pages 102
Published in Bulletin of The British Ornithologists' Club, in 1957, in volume 77, pages 44-46
Published in Bulletin of The British Ornithologists' Club, in 1957, in volume 77, pages 153-154
Published in Bulletin of The British Ornithologists' Club, in 1957, in volume 77, pages 155-156
Published in Bulletin of The British Ornithologists' Club, in 1957, in volume 77, pages 99-102
Published in Bulletin of the British Ornithologists' Club, in 1957, in volume 77, pages 10-16
Published in Bulletin of the British Ornithologists' Club, in 1957, in volume 77, pages 103