Published in Bulletin of The British Ornithologists' Club, in 1970, in volume 90, pages 91

Published in Bulletin of The British Ornithologists' Club, in 1970, in volume 90, pages 92-96

Published in Bulletin of The British Ornithologists' Club, in 1970, in volume 90, pages 97-105

Published in Bulletin of The British Ornithologists' Club, in 1970, in volume 90, pages 107-111

Published in Bulletin of The British Ornithologists' Club, in 1970, in volume 90, pages 111-115

Published in Bulletin of The British Ornithologists' Club, in 1970, in volume 90, pages 115-116

Published in Bulletin of The British Ornithologists' Club, in 1970, in volume 90, pages 117

Published in Bulletin of The British Ornithologists' Club, in 1970, in volume 90, pages 118-119

Published in Bulletin of The British Ornithologists' Club, in 1970, in volume 90, pages 119

Published in Bulletin of The British Ornithologists' Club, in 1970, in volume 90, pages 120

Published in Bulletin of The British Ornithologists' Club, in 1970, in volume 90, pages 122-124

Published in Bulletin of The British Ornithologists' Club, in 1970, in volume 90, pages 124-129

Published in Bulletin of The British Ornithologists' Club, in 1970, in volume 90, pages 131-132

Published in Bulletin of The British Ornithologists' Club, in 1970, in volume 90, pages 133-134

Published in Bulletin of The British Ornithologists' Club, in 1970, in volume 90, pages 134-135

Published in Bulletin of The British Ornithologists' Club, in 1970, in volume 90, pages 136-142

Published in Bulletin of The British Ornithologists' Club, in 1970, in volume 90, pages 142-144

Published in Bulletin of The British Ornithologists' Club, in 1970, in volume 90, pages 148-152

Published in Bulletin of The British Ornithologists' Club, in 1970, in volume 90, pages 152-157

Published in Bulletin of The British Ornithologists' Club, in 1970, in volume 90, pages 154-157

Published in Bulletin of The British Ornithologists' Club, in 1970, in volume 90, pages 157

Published in Bulletin of The British Ornithologists' Club, in 1970, in volume 90, pages 158-161

Published in Bulletin of The British Ornithologists' Club, in 1970, in volume 90, pages 161-162

Published in Bulletin of the British Ornithologists’ Club, in 1970, in volume 90, pages 164-166

Published in Bulletin of The British Ornithologists' Club, in 1970, in volume 90, pages 166-168

Published in Bulletin of The British Ornithologists' Club, in 1970, in volume 90, pages 168-172

Published in Bulletin of the British Ornithologists' Club, in 1970, in volume 90, issue 3, pages 78-80

Published in Bulletin of the British Ornithologists' Club, in 1970, in volume 90, issue 6, pages 145-148