Published in Bulletin of The British Ornithologists' Club, in 1968, in volume 88, pages 1-4

Published in Bulletin of The British Ornithologists' Club, in 1968, in volume 88, pages 4-15

Published in Bulletin of The British Ornithologists' Club, in 1968, in volume 88, pages 15-20

Published in Bulletin of The British Ornithologists' Club, in 1968, in volume 88, pages 21-24

Published in Bulletin of The British Ornithologists' Club, in 1968, in volume 88, pages 24-25

Published in Bulletin of The British Ornithologists' Club, in 1968, in volume 88, pages 25-30

Published in Bulletin of The British Ornithologists' Club, in 1968, in volume 88, pages 30-31

Published in Bulletin of The British Ornithologists' Club, in 1968, in volume 88, pages 32-36

Published in Bulletin of The British Ornithologists' Club, in 1968, in volume 88, pages 37-43

Published in Bulletin of The British Ornithologists' Club, in 1968, in volume 88, pages 43-48

Published in Bulletin of The British Ornithologists' Club, in 1968, in volume 88, pages 48-53

Published in Bulletin of The British Ornithologists' Club, in 1968, in volume 88, pages 53-55

Published in Bulletin of The British Ornithologists' Club, in 1968, in volume 88, pages 55-56

Published in Bulletin of The British Ornithologists' Club, in 1968, in volume 88, pages 56

Published in Bulletin of The British Ornithologists' Club, in 1968, in volume 88, pages 57-58

Published in Bulletin of The British Ornithologists' Club, in 1968, in volume 88, pages 58-59

Published in Bulletin of The British Ornithologists' Club, in 1968, in volume 88, pages 59-73

Published in Bulletin of The British Ornithologists' Club, in 1968, in volume 88, pages 77-85

Published in Bulletin of The British Ornithologists' Club, in 1968, in volume 88, pages 85-90

Published in Bulletin of The British Ornithologists' Club, in 1968, in volume 88, pages 90-93

Published in Bulletin of The British Ornithologists' Club, in 1968, in volume 88, pages 93-96

Published in Bulletin of The British Ornithologists' Club, in 1968, in volume 88, pages 98-102

Published in Bulletin of The British Ornithologists' Club, in 1968, in volume 88, pages 102-108

Published in Bulletin of The British Ornithologists' Club, in 1968, in volume 88, pages 109

Published in Bulletin of The British Ornithologists' Club, in 1968, in volume 88, pages 110-112

Published in Bulletin of The British Ornithologists' Club, in 1968, in volume 88, pages 112

Published in Bulletin of The British Ornithologists' Club, in 1968, in volume 88, pages 113-116

Published in Bulletin of The British Ornithologists' Club, in 1968, in volume 88, pages 116-119

Published in Bulletin of The British Ornithologists' Club, in 1968, in volume 88, pages 119-120

Published in Bulletin of The British Ornithologists' Club, in 1968, in volume 88, pages 120-123

Published in Bulletin of The British Ornithologists' Club, in 1968, in volume 88, pages 123-126

Published in Bulletin of The British Ornithologists' Club, in 1968, in volume 88, pages 126-128

Published in Bulletin of The British Ornithologists' Club, in 1968, in volume 88, pages 129-130

Published in Bulletin of The British Ornithologists' Club, in 1968, in volume 88, pages 130-132

Published in Bulletin of The British Ornithologists' Club, in 1968, in volume 88, pages 133-134

Published in Bulletin of The British Ornithologists' Club, in 1968, in volume 88, pages 135

Published in Bulletin of The British Ornithologists' Club, in 1968, in volume 88, pages 138-139

Published in Bulletin of The British Ornithologists' Club, in 1968, in volume 88, pages 140-148

Published in Bulletin of The British Ornithologists' Club, in 1968, in volume 88, pages 148-150

Published in Bulletin of The British Ornithologists' Club, in 1968, in volume 88, pages 150-151

Published in Bulletin of The British Ornithologists' Club, in 1968, in volume 88, pages 151-152

Published in Bulletin of The British Ornithologists' Club, in 1968, in volume 88, pages 154-162

Published in Bulletin of The British Ornithologists' Club, in 1968, in volume 88, pages 160-162

Published in Bulletin of The British Ornithologists' Club, in 1968, in volume 88, pages 163-166

Published in Bulletin of The British Ornithologists' Club, in 1968, in volume 88, pages 166-171

Published in Bulletin of The British Ornithologists' Club, in 1968, in volume 88, pages 172

Published in Bulletin of The British Ornithologists' Club, in 1968, in volume 88, issue 2, pages 21