We have information from several sources:
Simon, J.E., A.F. Chadwick and L.E. Craker. 1984. Herbs: An Indexed Bibliography. 19711980.
Witloof Chicory: A New Vegetable Crop in the United StatesKenneth A. Corey, David J. Merchant, and Lester F. Whitney
Midwest Vegetable Production Guide for Commercial Growers 2012
Lettuce and Endive production links
Magness, J.R., G.M. Markle, C.C. Compton. 1971. Food and feed crops of the United States.
Handbook of Energy CropsJames A. Duke. 1983. unpublished.
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