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- Kurris, F.J.J.H. (author) doctoral thesis 1930
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- Korvezee, A.E. (author) doctoral thesis 1930
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- Van Houten, L. (author) doctoral thesis 1930
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- Flieringa, G. (author) doctoral thesis 1930
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Bosch van Rosenthal, E.J. (author)Overzicht van de historische ontwikkeling van de waterschappen en polderbesturen in Gelderland, met name in de Betuwe. bevat een groot aantal uitgebreide citaten uit oude documentendoctoral thesis 1930
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De Glee, G.J. (author)Calculation method for groundwaterflow in case of subraction of groundwater via vertical pumping wells for drinking water purposes. Both permanent and instationary pumping are considered.doctoral thesis 1930
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- Van Aken, J.S.A.J.M. (author) doctoral thesis 1930