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Vugts, Jan H. (author) report 1968
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van den Bosch, J.J. (author), Vugts, J.H. (author) report 1967
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Vugts, Jan H. (author) report 1967
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van den Bosch, J.J. (author), Vugts, J.H. (author) report 1967
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Vugts, J.H. (author), Remery, G.F.M. (author) report 1966
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Vugts, J.H. (author), Remery, G.F.M. (author) report 1966
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Vugts, Jan H. (author) report 1965
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Vugts, Jan H. (author) report 1965
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Vugts, Jan H. (author) report 1964