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      Gift-Gr?n Chemie in der Landwirtschaft u. die Folgen Andrea Ernst, Kurt Langbein, Hans Weiss:
      Guidelines for the safe use of wastewater and excreta in agriculture and aquaculture Measures for public health protection Prep. by Duncan Mara & Sandy Cairncross:
      Long-term effects of sewage sludge and farm slurries applications Proc. of a round-table seminar organized by the Commiss. of the Europ. communities, directorate-general science, research a. development, environment research progr., held in Pisa, Italy, 25-27 Sept. 1984 Ed. by J.H. Williams et al.:
      La pol?mica de la esclavitud ?lvaro Reynoso Francisco D?az Barreiro:
      Microelementele ?n agricultur? Prof. dr. doc. David Davidescu, conf. dr. Velicica Davidescu, dr. Radu L?c?tu?u:
      M?tr?gy?z?s, n?v?nyv?delem El?ad?sok, poszterek XIX Hungagrochem 1989. konf. Keszthely ; Szerk.: Blaske Zolt?nn?:
      Modelling nitrogen from farm wastes Models a. systems for studying the transformation a. fate of nitrogen from animal effluents applied to soils : Proc. of a Seminar in the EEC Progr. of coordination of research on animal effluents Ed. by J.K.R. Gasser:
      M?tr?gy?z?s, n?v?nyv?delem, korr?zi? v?delem El?ad?sok, poszterek XX Hungagrochem konf., 1990, Keszthely ; Szerk.: Blaske Zolt?nn?:
      Management of nitrogen and phosphorus fertilizers in Sub-Saharan Africa Proc. of a Symp., held in Lome, Togo, March 25-28, 1985 Ed. by A. Uzo Mokwunye a. Paul L. C. Vlek:
      Management systems to reduce impact of nitrates Publ. arrangements by Commiss. of the Europ. communities. Directorate-general. Telecommunications, inform. industries a. innovation, sci. a. techn. communication service, Luxembourg ; Ed. by J. C. Germon:




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