RT Journal Article SR Electronic T1 The Certification of Grapevines for Adherence to Variety and for Freedom from Disease JF American Journal of Enology and Viticulture JO Am J Enol Vitic. FD American Society for Enology and Viticulture SP 23 OP 26 DO 10.5344/ajev.1955.6.1.23 VO 6 IS 1 A1 C. J. Alley YR 1955 UL http://www.ajevonline.org/content/6/1/23.abstract AB