http://pec.lib.wvu.edu/record/P169091938Microchemical studies of potato tubers affected with blue stem disease. Journal article reprint from: <em>Journal of Agricultural Research,</em> v.57:no.5 (1938:Sept.1). Hill, L. M.Orton, C. R. (Clayton Roberts), b. 1885.Potatoes--Diseases and pests.14256