| Citation | Ferrer, X. and A. Martinez-Vilalta 1986 Fluctuations of the Gull and Tern populations in the Ebro Delta, North-east Spain (1960-85). Seabirds In MEDMARAVIS and Monbailliu, X. (eds.), Mediterranean Marine Avifauana. Population Studies and Conservation. NATO ASI Series, Vol. G12, Springer Verlag, Berlin, Germany 273-284. |
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| Ref. No. | 6218 |
| Language | English |
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