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Chan, Y.Y. (author) report 1967
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Vugts, Jan H. (author) report 1967
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Versluis, Aad (author) report 1967
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Versluis, Aad (author) report 1967
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Kantorowitz, E. (author) report 1967
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Bisshopp, F.E. (author) report 1967
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Versluis, Aad (author) report 1968
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Vugts, Jan H. (author) report 1968
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Versluis, Aad (author) report 1968
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Bisshopp, F.E. (author), Wilson, R.B. (author) report 1968
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Versluis, Aad (author) report 1968
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Glansdorp, C.C. (author) report 1968
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Chan, Robert K. -C. (author), Strelkoff, Theodor (author) report 1969
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Bijl, J. (author) report 1969
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Bisshopp, F.E. (author) report 1969
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Vugts, Jan H. (author) report 1969
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Keizer, Ed W.H. (author), Vermey, P. (author), Huisman, J. (author) report
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Bisshopp, F.E. (author) report 1970
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de Wit, Cornelis (author) report 1970
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de Wit, Cornelis (author) report