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First-egg date fluctuations for the Pied Flycatcher Ficedula hypoleuca in the woodlands of mid-Wales in the twentieth century |
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| Authors: | EM. SLATER |
| Affiliation: | School of Biosciences, Cardiff University, and Llysdinam Field Centre, Newbridge-on-Wye, Powys, LD1 6NB, UK |
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