https://www.bto.org/our-work/science/publications/reports/research-reports/relative-abundance-birds-farmland-relation-game-cover-and
The relative abundance of birds on farmland in relation to game-cover and winter bird crops
The relative abundance of birds on farmland in relation to game-cover and winter bird crops
Citation
Henderson, I.G., Vickery, J.A. & Carter, N. 2001. The relative abundance of birds on farmland in relation to game-cover and winter bird crops.
