books وصات خارجية
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Source: wikipedia.org
وصات خارجية (Info)
- Food and Agriculture Organization of the United Nations – www.fao.org
- OECD Department for Trade and Agriculture: Food, Agriculture and Fisheries
- OECD Agricultural Outlook Database (2006–2015)
- Field, Alexander J. (2008). David R. Henderson (المحرر). Productivity (الطبعة 2nd). Indianapolis: Library of Economics and Liberty. ISBN 978-0865976658. OCLC 237794267. مؤرشف من الأصل في 07 مايو 2020. الوسيط
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