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- Hartman, H. (author) doctoral thesis 1925
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- Zeijlmans van Emmichoven, C.P.A. (author) doctoral thesis 1925
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- Roegholt, M.J.W. (author) doctoral thesis 1925
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- Wessel, W. (author) doctoral thesis 1924
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- Meulenhoff, J. (author) doctoral thesis 1924
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- Van der Schaaff, M.L. (author) doctoral thesis 1924
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- Slothouwer, D.F. (author) doctoral thesis 1924
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- De Wijs, H.J. (author) doctoral thesis 1923
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- Bertram, J.F. (author) doctoral thesis 1923
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- Heslinga, J. (author) doctoral thesis 1923
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- Van Nellensteyn, F.J. (author) doctoral thesis 1923
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- Von Wolzogen Kühr, C.A.H. (author) doctoral thesis 1923
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- Goudriaan, J. (author) doctoral thesis 1922
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- doctoral thesis 1922