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Rheinische Friedhofsgaertner : durchschnittlich zufriedenstellend \ Deutscher Gartenbau [Artikel]
Kerstjens, K.-H. \ Roth, K. \ Walser, M. \ 1995
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Rheinische Friedhofsgaertnereien im Vergleich \ Gaertnerboerse : Zeitschrift fuer Produktion, Handel und Dienstleistung im Erwerbsgartenbau [Artikel]
Roth, K. \ Kerstjens, K.H. \ Walser, M. \ 1994
Bedrijfsvergelijkend rentabiliteitsonderzoek van groenverzorgers, gespecialiseerd in het onderhouden van kerkhoven (periode 1992)
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