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  • Evans, A.D., Smith, K.W., Buckingham, D.L. & Evans, J. (1997) Seasonal variation in breeding performance and nestling diet of cirl bunting Emberiza cirlus in England. Bird Study., 44, 6679.
  • Farrell, L. (1989) The different types and importance of British heaths. Botanical Journal of the Linnean Society, 101, 291299.
  • Farrell, L. (1993) Lowland Heathland: the extent of habitat change. English Nature Science Report No. 12. English Nature, Peterborough .
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  • Sitters, H.P. (1991) A study of foraging behaviour and parental care in the cirl hunting Emberiza cirlus. MSc Thesis, University of Aberdeen.
  • Swash, A.R.H. (1997) Environmentally Sensitive Areas in the UK and their grassland resource. Grassland Management in Environmentally Sensitive Arm (ed. R.Sheldrick), pp. 3443. Occasional Symposium of the British Grassland Society No. 32. BGS, Reading .
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  • Wyatt, B.K., Greatorex-Davies, J.N., Hill, M.O., Parr, T.W., Bunce, R.G.H. & Fuller, R.M. (1994) Comparison of Lund Cover Definitions. Department of the Environment: London .