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Sárfalvi, Béla - In: Geographical types of Hungarian agriculture, (pp. 47-56). 1966

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Sampson, Neil - In: Food security in the United States, (pp. 11-26). 1984

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Ryszkowski, Lech - 1980

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Schadler, Friedrich - In: Berichte aus Forschung und Hochschulleben der … 4 (1957/1960), pp. 102-108

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Santiago Leitón S., Juan; Sáenz R., Rodrigo - 1958

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Haussmann, Giovanni - 1965

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Hempel, Ludwig - In: Die Erde : journal of the Geographical Society of … 98 (1967) 1, pp. 5-30

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Hempel, Ludwig - In: Geographica Helvetica : Swiss journal of geography 15 (1960) 3, pp. 147-151

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Schaefer, Ingo - In: Petermanns geographische Mitteilungen : PGM ; … 101 (1957) 3, pp. 194-199

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Reschke, K. - In: Zeitschrift für Kulturtechnik : Ergebnisse d. … 2 (1961) 4, pp. 193-216

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