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by Dobben, H. F. van.;
Year: 1992., Callno: 556.12:550.47(492) IMP
Book
by Jansen, P. C. M.;
Callno: 05:63(492)
Journal
by Westphal, E.; Westphal-Stevens, J. M. C.;
Year: 1975., Callno: 63(63) WES
Book
by Hondius, P.; De Ridder, N. A.; Hellings, A. J.; Institute for Land and Water Management Research (Wageningen);
Year: 1967., Callno: 556.38(492) DER
Book