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The British Trust for Ornithology Notes and Announcements |
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| Authors: | L. A. Batten |
| Affiliation: | Populations Section , British Trust for Ornithology , Beech Grove, Tring, Hertfordshire |
| Abstract: | Inland roosts did not show increased numbers during spring migration, and midsummer roosts of non-breeders proved less extensive than had been supposed |
| Keywords: | |