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Heydra, G. (author) report 1982
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Kuur, P. van der (author) report 1979
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Heydra, G. (author) report 1979
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Karelse, M. (author) report 1978
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Kuur, P. van der (author) report 1978
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Heydra, G. (author) report 1977
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Hartsuiker, G. (author) report 1977
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Karelse, M. (author) report 1977
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Roelfzema, A. (author) report 1977
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Wijngaarden, N.J. van (author) report 1975
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Ligteringen, H. (author) report 1974