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Gerritsma, J. (author) report 1989
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Gerritsma, J. (author) report 1989
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Gerritsma, J. (author) report 1989
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Gerritsma, J. (author) report 1988
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Gerritsma, J. (author) report 1988
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Gerritsma, J. (author) report 1988
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Gerritsma, J. (author) report 1987
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Gerritsma, J. (author) report 1984
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Gerritsma, J. (author) report 1984
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Gerritsma, J. (author) report 1983
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Gerritsma, J. (author) report 1983
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Gerritsma, J. (author) report 1983
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Gerritsma, J. (author) report 1982
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Gerritsma, J. (author) report 1981
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Gerritsma, J. (author) report 1980
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Gerritsma, J. (author) report 1978
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Gerritsma, J. (author) report 1976
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Gerritsma, J. (author) report 1974
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Brozius, L.H. (author), Gerritsma, J. (author), Moeyes, G. (author) report 1973
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Gerritsma, J. (author) report 1973