| Citation | Garthe, S., B.-O. Flore, B. Hälterlein, O. Hüppop, U. Kubetzki and P. Südbeck 2000 Breeding population developments of gulls (Laridae) at the German North Sea coast in the second half of the 20th century. Seabirds Vogelwelt 121:1-13. |
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| Ref. No. | 4305 |
| Language | English |
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