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[4] Harre, R. (1985). The Philosophy of Science. Second edition. Oxford University Press, Oxford.
[5] Lane, S.N. (2001). Constructive Comments on D. Massey ‘Space-time, science and the relationship between physical geography and human geography’. Transactions of the Institute of British Geographers, 26: 243-256.
[6] Inkpen, R. (2005). Science, Philosophy and Physical Geography, Rutledge, London.
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