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Witzenhausen: Selbstverl. des Verbandes der Tropenlandwirte Witzenhausen, 1998
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Aichtal: Margraf, 1987
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Hannover: Technische Informationsbibliothek (TIB), 2013
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Hannover : Gottfried Wilhelm Leibniz Universität Hannover, 2013
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Frederiksberg, Denmark: Department of Food and Resource Economics (IFRO), University of Copenhagen, February 2020
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Oslo: Statistics Norway, Research Dep., Mar. 2008
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Rome: Food and Agriculture Organization of the United Nations, 2017