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Haas, R.G. (author) report 1980
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Heydra, G. (author) report 1977
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Heydra, G. (author) report 1979
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Ludikhuize, D. (author) report 1984
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Kerstma, J. (author) report 1979
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Heydra, G. (author) report 1982
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Casteleyn, J.A. (author) report 1978
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Ligteringen, H. (author) report 1974
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Heydra, G. (author) report 1977
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Haas, R.G. (author) report 1980
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document
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Casteleyn, J.A. (author) report 1979
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Ludikhuize, D. (author) report 1982
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Ludikhuize, D. (author) report 1983
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Ludikhuize, D. (author) report 1981
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Uwland, J. (author) report 1982
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Oudshoorn, C.R.M. (author) report 1981
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Heijdra, G. (author) report 1980
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Ludikhuize, D. (author) report 1983
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Kuur, P. van der (author) report 1980
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Kerstma, J. (author) report 1982