Published in Bulletin of The British Ornithologists' Club, in 1934, in volume 54, pages 86-87

Published in Bulletin of The British Ornithologists' Club, in 1934, in volume 54, pages 96-97

Published in Bulletin of the British Ornithologists' Club, in 1934, in volume 54, pages 148-160

Published in Bulletin of The British Ornithologists' Club, in 1934, in volume 54, pages 179-180