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2. A provisional map of forest types for the British Isles 5000 years ago
3. Beckensall, S. and Laurie, T. (1998) Prehistoric Rock Art of County Durham, Durham.
4. Bonsall, C. (ed.) (1985) The Mesolithic in Europe: Papers presented at the Third International Symposium, Donald, Edinburgh.
5. Bradley, R. (1997) Rock Art and the Prehistory of Atlantic Europe, Routledge.