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van Veen, J. (author)Report to the Ministry regarding the purchase of echosounders; a comparision between a British (Hughes) and a German system. (Report in Dutch with full English translation)report 1933
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Steggewentz, J.H. (author)Method to calculate variations in groundwater level due to the tidal variation at sea and in tidal rivers. Research on groundwater flow and water pressure in ground water due to harmonic variations.doctoral thesis 1933
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Anonymous, A. (author)In het rapport wordt kritiek geleverd over de voorgestelde normalisatie van de Nederlandsche vaarwegen. Tevens worden nieuwe normalisatie-afmetingen voorgesteld.report 1933
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Schönfeld, J.F. (author), Kleinjan, I.L. (author), van den Burg, J.H. (author), Mazure, J.P. (author)Studiereis naar Oost Friesland om inzicht te krijgen in de landaanwinningswerken aldaar, de kustverdediging van de waddeneilanden en de verbetering van de vaargeulen. Overzicht over hoe de Duitse diensten hun waarnemingen uitvoeren.report 1933
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