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by Koch, Werner.; Schmutterer, H. (Heinz); Kranz, Jurgen.;
Year: c1977., Callno: 632(213) DIS
Book
Utilization and control of water hyacinth in Sudan / by Ottmar Philipp, Werner Koch and Heinz Koser.
by Deutsche Gesellschaft fur Technische Zusammenarbeit.; Koch, Werner.; Koser, Heinz.; Philipp, Ottmar.;
Year: 1983., Callno: 632.556.7(624) PHI
Book