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8by Bertram, G. C. L., Houston, Clarence Stuart, Richardson, JohnGet access
Published in The Geographical Journal (1986)
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9by Bertram, G. C. L., Edholm, O. G., Gunderson, E. K. E.Get access
Published in The Geographical Journal (1974)
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12by Fleming, W. L. S., Stephenson, A., Roberts, B. B., Bertram, G. C. L.Get access
Published in The Geographical Journal (1938)
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