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Oliver, T.H., Gillings, S., Girardello, M., Rapacciuolo, G., Brereton, T.M., Siriwardena, G., Roy, D.B., Pywell, R. & Fuller, R.J. 2012. Population density but not ...
Newson, S.E., Woodburn, R., Noble, D.G., Baillie, S.R. & Gregory, D.G. 2005. Evaluating the Breeding Bird Survey for producing national population size and density ...
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