We have information from several sources:
FactSHEET—contributed by: Wanda W. Collins
Root Vegetables: New Uses for Old Crops—Wanda W. Collins
Tropical Root and Tuber Crops—Stephen K. O'Hair
Plant Nutrient Composition Altered With Controlled Environments for Future Space Life-Support Systems—S. Suzanne Nielsen, Martha A. Belury, Kwangok P. Nickel, and Cary A. Mitchell
Evaluation of Tropical Leaf Vegetables in the Virgin Islands—Manuel C. Palada and Stafford M.A. Crossman
Handbook of Energy Crops—James A. Duke. 1983. unpublished.
Sweetpotato—production links
Magness—J.R., G.M. Markle, C.C. Compton. 1971. Food and feed crops of the United States.
Outside Links
Sweet Potato—FAO/IPGRI Technical Guidelines for the Safe Movement of Sweet Potato Germplasm—Link to the publication on the International Plant Genetic Resources Institute web site