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Gerritsma, J. (author) report 1954
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Gerritsma, J. (author) journal article 1954
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Balhan, Dr.ir. J. (author), Gerritsma, J. (author) report 1954
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Dobson, R.J.C. (author), Gerritsma, J. (author), Veldhuyzen, J.P. (author) report 1953
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Dobson, R.J.C. (author), Gerritsma, J. (author), Veldhuyzen, J.P. (author) report 1953
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Dobson, R.J.C. (author), Gerritsma, J. (author), Pereboom, J. (author) report 1952
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Gerritsma, J. (author) report 1952
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Gerritsma, J. (author) report 1952
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Gerritsma, J. (author) report 1952
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Gerritsma, J. (author) journal article 1952
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Gerritsma, J. (author), Visser, H. (author), Schneiders, C.C.M. (author) report 1951
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Gerritsma, J. (author), Visser, H. (author), Schneiders, C.C.M. (author) report 1951