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de Jong, H.R. (author) report 1953
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de Jong, D (author) report 1961
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de Jong, Bart (author) report 1965
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de Jong, Bart (author) report 1967
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de Back, J. (author), de Jong, A. (author) report 1968
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de Jong, A. (author) report 1968
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de Jong, Bart (author) report 1969
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de Jong, J.L. (author), van Ingen Schenau, H.A. (author), Pietersen, O.B.M. (author) report 1969
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de Jong, J.L. (author), van Ingen Schenau, H.A. (author), Pietersen, O.B.M. (author), Doekes, G. (author), van Eek, G.M. (author) report 1969
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de Jong, J.L. (author), van Ingen Schenau, H.A. (author), Pietersen, O.B.M. (author) report 1969
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van. Beek, T. (author), de Jong, H. (author) report
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de Jong, Bart (author) report
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de Jong, A. (author) report 1970
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de Jong, A. (author) report 1970
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de Jong, A. (author) report 1970
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de Jong, A. (author) report 1970
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de Jong, Th. (author) report 1971
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de Jong, A. (author), Kuperus, A. (author) report 1972
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de Jong, Bart (author) report 1973
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de Jong, Bart (author) report 1973
