We have information from several sources:
Handbook of Energy CropsJames A. Duke. 1983. unpublished.
Rye: Alternative Field Crops Manual, University of Wisconson Cooperative Extension Service, University of Minnesota Extension Service, Center for Alternative Plant & Animal Products
New Crops for Canadian AgricultureErnest SmallWinter Cover CropsTheir Value and Management
MagnessJ.R., G.M. Markle, C.C. Compton. 1971. Food and feed crops of the United States.
ECP/GR Challenges in Rye Germplasm Conservationby T. Gass, W. Podyma, J. Puchalski, S.A. Eberhart (compilers)Link to the publication on the International Plant Genetic Resources Institute web site