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Bewertungsverfahren von Fliessgewaessern \ Wasser + Boden : Zeitschrift fuer Wasser- und Abfallwirtschaft [Artikel]
Timmer, G. \ Sutoris, M. \ Gruber, P. \ 1992
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Was ist von Guellezusaetzen zu halten? \ Praktische Landtechnik [Artikel]
Gruber, P. \ 1991
Naast water worden in het kort 5 toevoegmiddelen voor mest besproken
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Was kostet die Maschine pro Betriebsstunde? \ Praktische Landtechnik [Artikel]
Gruber, P. \ 1990
Een kostenplaatje, uitgewerkt bij de tractor 55 kW Allrad
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Erfolgreiche Duengerwirtschaft heute [Boek]
Gruber, P. \ 1981
A practical book about all types of manure (inorganic and organic). Many figures on composition, withdrawal of nutrients, efficiencies etc. are given
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