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Koenig, Rich and Kuhns, Mike: Control of Iron Chlorosis in Ornamental and Crop Plants. (Utah State University, Salt Lake City, August 1996) p.3 3 Ağustos 2016 tarihinde Wayback Machine sitesinde arşivlendi.
Koenig, Rich and Kuhns, Mike: Control of Iron Chlorosis in Ornamental and Crop Plants. (Utah State University, Salt Lake City, August 1996) p.3 3 Ağustos 2016 tarihinde Wayback Machine sitesinde arşivlendi.