Published in Bulletin of The British Ornithologists' Club, in 1990, in volume 110, pages 6-7

Published in Bulletin of The British Ornithologists' Club, in 1990, in volume 110, pages 7-9

Published in Bulletin of The British Ornithologists' Club, in 1990, in volume 110, pages 9-10

Published in Bulletin of The British Ornithologists' Club, in 1990, in volume 110, pages 14-20

Published in Bulletin of The British Ornithologists' Club, in 1990, in volume 110, pages 20-25

Published in Bulletin of The British Ornithologists' Club, in 1990, in volume 110, pages 26-31

Published in Bulletin of The British Ornithologists' Club, in 1990, in volume 110, pages 32-34

Published in Bulletin of The British Ornithologists' Club, in 1990, in volume 110, pages 35-37

Published in Bulletin of The British Ornithologists' Club, in 1990, in volume 110, pages 37-38

Published in Bulletin of The British Ornithologists' Club, in 1990, in volume 110, pages 38-43

Published in Bulletin of The British Ornithologists' Club, in 1990, in volume 110, pages 43-47

Published in Bulletin of The British Ornithologists' Club, in 1990, in volume 110, pages 48-51

Published in Bulletin of The British Ornithologists' Club, in 1990, in volume 110, pages 62-64

Published in Bulletin of The British Ornithologists' Club, in 1990, in volume 110, pages 64-65

Published in Bulletin of The British Ornithologists' Club, in 1990, in volume 110, pages 71-77

Published in Bulletin of The British Ornithologists' Club, in 1990, in volume 110, pages 77-79

Published in Bulletin of The British Ornithologists' Club, in 1990, in volume 110, pages 79-80

Published in Bulletin of The British Ornithologists' Club, in 1990, in volume 110, pages 83-86

Published in Bulletin of The British Ornithologists' Club, in 1990, in volume 110, pages 90-93

Published in Bulletin of The British Ornithologists' Club, in 1990, in volume 110, pages 93-94

Published in Bulletin of The British Ornithologists' Club, in 1990, in volume 110, pages 94-103

Published in Bulletin of The British Ornithologists' Club, in 1990, in volume 110, pages 103-107

Published in Bulletin of The British Ornithologists' Club, in 1990, in volume 110, pages 107-109

Published in Bulletin of The British Ornithologists' Club, in 1990, in volume 110, pages 109-110

Published in Bulletin of The British Ornithologists' Club, in 1990, in volume 110, pages 110

Published in Bulletin of The British Ornithologists' Club, in 1990, in volume 110, pages 123-126

Published in Bulletin of The British Ornithologists' Club, in 1990, in volume 110, pages 126-130

Published in Bulletin of The British Ornithologists' Club, in 1990, in volume 110, pages 137-138

Published in Bulletin of The British Ornithologists' Club, in 1990, in volume 110, pages 139-140

Published in Bulletin of The British Ornithologists' Club, in 1990, in volume 110, pages 140-141

Published in Bulletin of The British Ornithologists' Club, in 1990, in volume 110, pages 142-143

Published in Bulletin of The British Ornithologists' Club, in 1990, in volume 110, pages 143-145

Published in Bulletin of The British Ornithologists' Club, in 1990, in volume 110, pages 145-153

Published in Bulletin of The British Ornithologists' Club, in 1990, in volume 110, pages 153-159

Published in Bulletin of The British Ornithologists' Club, in 1990, in volume 110, pages 159-160

Published in Bulletin of The British Ornithologists' Club, in 1990, in volume 110, pages 167-169

Published in Bulletin of The British Ornithologists' Club, in 1990, in volume 110, pages 170-171

Published in Bulletin of The British Ornithologists' Club, in 1990, in volume 110, pages 171-175

Published in Bulletin of The British Ornithologists' Club, in 1990, in volume 110, pages 175-179

Published in Bulletin of The British Ornithologists' Club, in 1990, in volume 110, pages 181-184

Published in Bulletin of The British Ornithologists' Club, in 1990, in volume 110, pages 184-187

Published in Bulletin of The British Ornithologists' Club, in 1990, in volume 110, pages 187-193

Published in Bulletin of The British Ornithologists' Club, in 1990, in volume 110, pages 194-197

Published in Bulletin of The British Ornithologists' Club, in 1990, in volume 110, pages 198-202

Published in Bulletin of The British Ornithologists' Club, in 1990, in volume 110, pages 203-205

Published in Bulletin of The British Ornithologists' Club, in 1990, in volume 110, pages 205-206

Published in Bulletin of The British Ornithologists' Club, in 1990, in volume 110, pages 207-212

Published in Bulletin of The British Ornithologists' Club, in 1990, in volume 110, pages 213-222

Published in Bulletin of The British Ornithologists' Club, in 1990, in volume 110, pages 222-225

Published in Bulletin of The British Ornithologists' Club, in 1990, in volume 110, pages 225-226

Published in Bulletin of The British Ornithologists' Club, in 1990, in volume 110, issue 1, pages 13-14