Welsh Journals

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REFERENCES BALL, D. F. (1963). The Soils and Land Use of the District around Bangor and Beaumaris. Memoir of the Soil Survey of Great Britain. H.M.S.O., London. HOWELL, E. J. (1946). The Land of Britain. Parts 41-43. North Wales. London. HUGHES, R. E. (1958). Sheep Population and Environment in Snow- donia (North Wales). 7. Ecol. 46, 169-190. HUGHES, R. E. et al (1973). The Status of the Sheep in the Mountains of North Wales since Mediaeval Times. In Press. JONES, LL. I. (1967). Studies on Hill Land in Wales. Welsh Plant Breeding Station Technical Bulletin No. 2. Aberystwyth. MOORE, P. D. and CHATER, E. H. (1969). The Changing Vegetation of West-Central Wales in the Light of Human History. 7. Ecol. 57, 361-379. ROBERTS, R. A. (1959). Ecology of Human Occupation and Land Use in Snowdonia. 7. Ecol. 47, 317-323. Report of the Land Use Study Group 1966, H.M.S.O. The Nature Conservancy, Penrhos Road, Bangor, Caerns.