TY - JOUR T1 - Professional Training JF - American Journal of Enology and Viticulture JO - Am J Enol Vitic. SP - 33 LP - 34 DO - 10.5344/ajev.1959.10.1.33 VL - 10 IS - 1 AU - James F. Guymon Y1 - 1959/01/01 UR - http://www.ajevonline.org/content/10/1/33.abstract ER -