State of the UK's birds 2001
By R. D. Gregory et. al.
Annual Publication from the RSPB, BTO, WWT and JNCC. This summarises the 2001 results of various on-going long term population monitoring programs in relation to the long and short term population trends.
Gregory, R. D., Noble, D. G., Robinson, J. A., Stroud, D. A., Campbell, L. H., Rehfisch, M. M., Cranswick, P. A., Wilkinson, N. I., Crick, H. Q. P. and Green, R. E. 2002. The State of the UK's birds 2001. The RSPB, BTO, WWT and JNCC, Sandy.
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