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 46-49

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, 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

Published in Bulletin of the British Ornithologists' Club, in 1971, in volume 91, issue 4, pages 96-98