LONDON NATURAL HISTORY SOCIETY (1964). The Birds of the London Area. Rupert Hart- Davis, London. MANNS, L. (1967). Leaf-litter fauna in the ecology of ground-feeding birds. London Naturalist, 46, 116-125. MAYS, Robert. (1978). Henry Doubleday: the Epping Naturalist. Precision Press, Marlow. MELLUISH, W. D. (1960). Recent changes in the bird population of grassland with encroaching scrub at Bookham Common. London Naturalist, 39, 89-98. MELLUISH, W. D. (1969). Further notes on the bird population of grassland with encroaching scrub. London Naturalist, 48, 135-142. MONTIER, David (Ed.) (1977). Atlas of Breeding Birds of the London Area. Batsford, London. MORRIS, L. E. (1959). The three Poors' Fields of Ruislip. Journal of the Ruislip and District Natural History Society, 8, 1-4. McKENZIE, A. (1883). Epping Forest and its Management. London. McNAUGHTON, S. J. and WOLF, Larry L. (1973). General Ecology. Holt, Rinehart and Winston, New York. OWEN, D. F. (1974). What is Ecology? Oxford University Press, Oxford. PARSLOW, John (1973). Breeding Birds of Britain and Ireland: A Historical Survey. T. and A. D. Poyser, Berkhamsted. PETERKEN, G. F. (1974). A method for assessing woodland flora for conservation using indicator species. Biological Conservation, 6, 239-245. PLANT, C. W. et al. (1978). The birds of Wanstead Park and area in 1977. Wren Conservation Group Report, No. 4 Plaistow. QVIST, A. (1958). Epping Forest. Corporation of London. RACKHAM, Oliver (1976). Trees and Woodland in the British Landscape. Dent, London. SHEAIL, John (1976). Nature in Trust. Blackie, Glasgow and London. SIMMS, Eric (1971). Woodland Birds. Collins, London. SMITH, Stuart (1950). The Yellow Wagtail. Collins, London, VOOUS, K. H. (1960). Atlas of European Birds. Nelson, London. WALLACE, D. I. M. (1971). A profile of the winter bird community in Epping Forest. London Bird Report, 36, 75-83. WINSTANLEY, D. R., SPENCER, R. and WILLIAMSON, K. (1974). Where have all the Whitethroats gone? Bird Study, 21, 1-14. WRIGHTON, F. E. (1959). Poors' Field Survey, 1958: Plant Ecology. Journal of the Ruislip and District Natural History Society, 8, 5-10. YARRELL, W. (1843). A History of British Birds. London. 14