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Gerritsma, J. (author) report 1961
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Gerritsma, J. (author) report 1962
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Gerritsma, J. (author), Zunderdorp, H.J. (author) report 1962
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Gerritsma, J. (author) report 1962
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Gerritsma, J. (author) report 1962
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Gerritsma, J. (author), Beukelman, W. (author) report 1964
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Gerritsma, J. (author) report 1964
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Gerritsma, J. (author) report 1964
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Gerritsma, J. (author), Beukelman, W. (author) report 1965
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Gerritsma, J. (author) report 1965
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Gerritsma, J. (author) report 1966
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Gerritsma, J. (author), Smith, W.E. (author) report 1966
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Gerritsma, J. (author) report 1966
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Gerritsma, J. (author), van den Bosch, J.J. (author) report 1967
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Gerritsma, J. (author), Smith, W.E. (author) report 1967
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Gerritsma, J. (author), Beukelman, W. (author) report 1967
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Gerritsma, J. (author) report 1968
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Gerritsma, J. (author) report 1968
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Gerritsma, J. (author) report 1969
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Gerritsma, J. (author) report 1969