Published in Bulletin of The British Ornithologists' Club, in 1991, in volume 111, pages 4-11
Published in Bulletin of The British Ornithologists' Club, in 1991, in volume 111, pages 11-18
Published in Bulletin of The British Ornithologists' Club, in 1991, in volume 111, pages 19-28
Published in Bulletin of The British Ornithologists' Club, in 1991, in volume 111, pages 28-33
Published in Bulletin of The British Ornithologists' Club, in 1991, in volume 111, pages 33-35
Published in Bulletin of The British Ornithologists' Club, in 1991, in volume 111, pages 38-40
PHENOTYPES OF ADULT HYBRIDS BETWEEN HOUSE SPARROW PASSER-DOMESTICUS AND TREE SPARROW PASSER-MONTANUS
Published in Bulletin of The British Ornithologists' Club, in 1991, in volume 111, pages 44-46
Published in Bulletin of The British Ornithologists' Club, in 1991, in volume 111, pages 46-49
Published in Bulletin of The British Ornithologists' Club, in 1991, in volume 111, pages 49-51
Published in Bulletin of The British Ornithologists' Club, in 1991, in volume 111, pages 51-55
Published in Bulletin of The British Ornithologists' Club, in 1991, in volume 111, pages 59-70
Published in Bulletin of The British Ornithologists' Club, in 1991, in volume 111, pages 70-77
Published in Bulletin of The British Ornithologists' Club, in 1991, in volume 111, pages 77-90
Published in Bulletin of The British Ornithologists' Club, in 1991, in volume 111, pages 91-92
Published in Bulletin of The British Ornithologists' Club, in 1991, in volume 111, pages 92-95
Published in Bulletin of The British Ornithologists' Club, in 1991, in volume 111, pages 95-100
Published in Bulletin of The British Ornithologists' Club, in 1991, in volume 111, pages 104-110
Published in Bulletin of The British Ornithologists' Club, in 1991, in volume 111, pages 139-140
Published in Bulletin of The British Ornithologists' Club, in 1991, in volume 111, pages 140-145
Published in Bulletin of The British Ornithologists' Club, in 1991, in volume 111, pages 145-146
Published in Bulletin of The British Ornithologists' Club, in 1991, in volume 111, pages 147-149
Published in Bulletin of The British Ornithologists' Club, in 1991, in volume 111, pages 152-155
Published in Bulletin of The British Ornithologists' Club, in 1991, in volume 111, pages 172
Published in Bulletin of The British Ornithologists' Club, in 1991, in volume 111, pages 173-174
Published in Bulletin of The British Ornithologists' Club, in 1991, in volume 111, pages 183-186
Published in Bulletin of The British Ornithologists' Club, in 1991, in volume 111, pages 187-188
Published in Bulletin of The British Ornithologists' Club, in 1991, in volume 111, pages 189-190
Published in Bulletin of The British Ornithologists' Club, in 1991, in volume 111, pages 190-199
Published in Bulletin of The British Ornithologists' Club, in 1991, in volume 111, pages 199-209
Published in Bulletin of The British Ornithologists' Club, in 1991, in volume 111, pages 209-215
Published in Bulletin of The British Ornithologists' Club, in 1991, in volume 111, pages 215-217
Published in Bulletin of The British Ornithologists' Club, in 1991, in volume 111, pages 222-225
Published in Bulletin of The British Ornithologists' Club, in 1991, in volume 111, pages 228-236
Published in Bulletin of The British Ornithologists' Club, in 1991, in volume 111, pages 237-239
Published in Bulletin of The British Ornithologists' Club, in 1991, in volume 111, issue 2, pages 101-104
Published in Bulletin of The British Ornithologists' Club, in 1991, in volume 111, issue 3, pages 120-138
Published in Bulletin of The British Ornithologists' Club, in 1991, in volume 111, issue 3, pages 156-171
Published in Bulletin of The British Ornithologists' Club, in 1991, in volume 111, issue 4, pages 217-222