Citation
Marchant, J.H., Freeman, S.N., Crick, H.Q.P. & Beaven, L.P. 2004. The BTO Heronries Census of England and Wales 1928-2000: new indices and a comparison of analytical methods. Ibis 146: 334. doi:10.1111/j.1474-919X.2004.00272.x
Staff author(s)
John Marchant