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document
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Bannink, W.J. (author), Nebbeling, C. (author) report 1968
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Bannink, W.J. (author), Reyn, J.W. (author) report 1967
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Bannink, W.J. (author), Nebbeling, C. (author), Reyn, J.W. (author) report 1965
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Bannink, W.J. (author) report 1963