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Oelke, E. A. ; Oplinger, E. S. ; Teynor, T. M. ; Putnam, D. H. ; Doll, J. D. ; Kelling, K. A. ; Durgan, B. R. ; Noetzel, D. M., 1992. Safflower. Alternative Field Crop Manual, University of Wisconsin-Exension, Cooperative Extension