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Kuur, P. van der (author) report 1978
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Heydra, G. (author) report 1977
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Kuur, P. van der (author) report 1977
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Kuur, P. van der (author) report 1977
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Hartsuiker, G. (author) report 1977
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Heydra, G. (author) report 1977
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Roelfzema, A. (author) report 1977
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Roelfzema, A. (author) report 1976
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Wijngaarden, N.J. van (author) report 1976
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Koenis, J.P. (author) report 1975
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Ligteringen, H. (author) report 1974
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Mazijk, A. van (author) report 1973
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Breusers, H.N.C. (author) report 1965
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Sybesma, R.P (author) report 1961