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Holst, C.P. (author) doctoral thesis 1924
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De Wijs, H.J. (author) doctoral thesis 1923
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Hetzel, W.H. (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
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Van Heurn, F.C. (author) doctoral thesis 1922
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Derx, H.G. (author) doctoral thesis 1922
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Van Thiel, E. (author) doctoral thesis 1922
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Van Groningen, P. (author) doctoral thesis 1921
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Schonebaum, C.W. (author) doctoral thesis 1921
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Hisschemöller, F.W. (author) doctoral thesis 1921
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Borren, J.J. (author) doctoral thesis 1921
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Gerretsen, F.C. (author) doctoral thesis 1921
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Couvert, H. (author) doctoral thesis 1921
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Lely, C.W. (author) doctoral thesis 1921
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Pohlmann, J. (author) doctoral thesis 1920