By P. L. Woomer, M. J. Swift
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By A. Page
By Fossey, Dian
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By Patrick J Michaels
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By Institute of Civil Engineers
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By Roger B. Hanson (Universitetet i Bergen, Norway), Hugh W. Ducklow (College of William and Mary, Virginia), John G. Field (University of Cape Town)
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By Eric F. Lambin, Helmut J. Geist
By D J Leggett, N Cooper, R Harvey
By Great Britain: Department of the Environment, Transport and the Regions
By Sands, Phillipe
By A. M. Muir Wood, C.A. Fleming
By Krell, Dorothy
By unkown
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By Lodewijks, J.M.
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