Published in Bulletin of The British Ornithologists' Club, in 1992, in volume 112, pages 6-11

Published in Bulletin of The British Ornithologists' Club, in 1992, in volume 112, pages 12-22

Published in Bulletin of The British Ornithologists' Club, in 1992, in volume 112, pages 22-27

Published in Bulletin of The British Ornithologists' Club, in 1992, in volume 112, pages 27-34

Published in Bulletin of The British Ornithologists' Club, in 1992, in volume 112, pages 34-36

Published in Bulletin of The British Ornithologists' Club, in 1992, in volume 112, pages 36-42

Published in Bulletin of The British Ornithologists' Club, in 1992, in volume 112, pages 42-49

Published in Bulletin of The British Ornithologists' Club, in 1992, in volume 112, pages 50-53

Published in Bulletin of The British Ornithologists' Club, in 1992, in volume 112, pages 53-55

Published in Bulletin of The British Ornithologists' Club, in 1992, in volume 112, pages 55-56

Published in Bulletin of The British Ornithologists' Club, in 1992, in volume 112, pages 61-64

Published in Bulletin of The British Ornithologists' Club, in 1992, in volume 112, pages 66-73

Published in Bulletin of The British Ornithologists' Club, in 1992, in volume 112, pages 74-81

Published in Bulletin of The British Ornithologists' Club, in 1992, in volume 112, pages 81-85

Published in Bulletin of The British Ornithologists' Club, in 1992, in volume 112, pages 86-98

Published in Bulletin of The British Ornithologists' Club, in 1992, in volume 112, pages 98-101

Published in Bulletin of The British Ornithologists' Club, in 1992, in volume 112, pages 102-108

Published in Bulletin of The British Ornithologists' Club, in 1992, in volume 112, pages 108-111

Published in Bulletin of The British Ornithologists' Club, in 1992, in volume 112, pages 111-125

Published in Bulletin of The British Ornithologists' Club, in 1992, in volume 112, pages 126-129

Published in Bulletin of The British Ornithologists' Club, in 1992, in volume 112, pages 129-132

Published in Bulletin of The British Ornithologists' Club, in 1992, in volume 112, pages 132-133

Published in Bulletin of The British Ornithologists' Club, in 1992, in volume 112, pages 133-134

Published in Bulletin of The British Ornithologists' Club, in 1992, in volume 112, pages 134-135

Published in Bulletin of The British Ornithologists' Club, in 1992, in volume 112, pages 143-150

Published in Bulletin of The British Ornithologists' Club, in 1992, in volume 112, pages 150-157

Published in Bulletin of The British Ornithologists' Club, in 1992, in volume 112, pages 158-165

Published in Bulletin of The British Ornithologists' Club, in 1992, in volume 112, pages 166-169

Published in Bulletin of The British Ornithologists' Club, in 1992, in volume 112, pages 169-174

Published in Bulletin of The British Ornithologists' Club, in 1992, in volume 112, pages 174-179

Published in Bulletin of The British Ornithologists' Club, in 1992, in volume 112, pages 180-181

Published in Bulletin of The British Ornithologists' Club, in 1992, in volume 112, pages 182-185

Published in Bulletin of The British Ornithologists' Club, in 1992, in volume 112, pages 191-205

Published in Bulletin of The British Ornithologists' Club, in 1992, in volume 112, pages 205-207

Published in Bulletin of The British Ornithologists' Club, in 1992, in volume 112, pages 213-218

Published in Bulletin of The British Ornithologists' Club, in 1992, in volume 112, pages 218-225

Published in Bulletin of The British Ornithologists' Club, in 1992, in volume 112, pages 225-231

Published in Bulletin of The British Ornithologists' Club, in 1992, in volume 112, pages 231-234

Published in Bulletin of The British Ornithologists' Club, in 1992, in volume 112, pages 235-244

Published in Bulletin of The British Ornithologists' Club, in 1992, in volume 112, pages 244-247

Published in Bulletin of The British Ornithologists' Club, in 1992, in volume 112, pages 247-250

Published in Bulletin of The British Ornithologists' Club, in 1992, in volume 112, pages 264-270

Published in Bulletin of The British Ornithologists' Club, in 1992, in volume 112, pages 270-274

Published in Bulletin of The British Ornithologists' Club, in 1992, in volume 112, pages 274-275

Published in Bulletin of The British Ornithologists' Club, in 1992, in volume 112, pages 275-276

Published in Bulletin of The British Ornithologists' Club, in 1992, in volume 112, pages 276-277

Published in Bulletin of The British Ornithologists' Club, in 1992, in volume 112, pages 277-279

Published in Bulletin of the British Ornithologists' Club, in 1992, in volume 112, issue 4, pages 250-264

Published in Bulletin of the British Ornithologists' Club, in 1992, in volume 122A, pages 3-9

Published in Bulletin of the British Ornithologists' Club, in 1992, in volume 122A, pages 11-38

Published in Bulletin of the British Ornithologists' Club, in 1992, in volume 122A, pages 39-52

Published in Bulletin of the British Ornithologists' Club, in 1992, in volume 122A, pages 53-72

Published in Bulletin of the British Ornithologists' Club, in 1992, in volume 122A, pages 73-86

Published in Bulletin of the British Ornithologists' Club, in 1992, in volume 122A, pages 87-96

Published in Bulletin of the British Ornithologists' Club, in 1992, in volume 122A, pages 97-106

Published in Bulletin of the British Ornithologists' Club, in 1992, in volume 122A, pages 107-158

Published in Bulletin of the British Ornithologists' Club, in 1992, in volume 122A, pages 159-167

Published in Bulletin of the British Ornithologists' Club, in 1992, in volume 122A, pages 169-190

Published in Bulletin of the British Ornithologists' Club, in 1992, in volume 122A, pages 191-198

Published in Bulletin of the British Ornithologists' Club, in 1992, in volume 122A, pages 199-208

Published in Bulletin of the British Ornithologists' Club, in 1992, in volume 122A, pages 209-216

Published in Bulletin of the British Ornithologists' Club, in 1992, in volume 122A, pages 217-224

Published in Bulletin of the British Ornithologists' Club, in 1992, in volume 122A, pages 237-249

Published in Bulletin of the British Ornithologists' Club, in 1992, in volume 122A, pages 251-259

Published in Bulletin of the British Ornithologists' Club, in 1992, in volume 122A, pages 261-266

Published in Bulletin of the British Ornithologists' Club, in 1992, in volume 122A, pages 267-309