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Gerritsma, J. (author), Smith, W.E. (author)
journal article 1967
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Gerritsma, J. (author), Smith, W.E. (author)
journal article 1967
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Gerritsma, J. (author), Smith, W.E. (author)
report 1967
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Gerritsma, J. (author), Smith, W.E. (author)
report 1966
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