Hop: Alternative Field Crops Manual, University of Wisconson Cooperative Extension Service, University of Minnesota Extension Service, Center for Alternative Plant & Animal Products
Handbook of Energy CropsJames A. Duke. 1983. unpublished.
Herbs Affecting the Central Nervous SystemVarro E. Tyler
Magness, J.R., G.M. Markle, C.C. Compton. 1971. Food and feed crops of the United States.
Humulus Accessions available through the National Germplasm Repository, Corvallis, Oregon.
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