RT Journal Article SR Electronic T1 Methods of Determining Field Maturity of Grapes JF American Journal of Enology and Viticulture JO Am J Enol Vitic. FD American Society for Enology and Viticulture SP 37 OP 40 DO 10.5344/ajev.1958.9.1.37 VO 9 IS 1 A1 M. A. Amerine A1 E. B. Roessler YR 1958 UL http://www.ajevonline.org/content/9/1/37.abstract AB