Frank, K. (1967). Grapes and Wines in Eastern U.S.A. https://oaks.kent.edu/node/3427
Frank, Konstantin. 1967. “A”. https://oaks.kent.edu/node/3427.
Frank, K. Grapes and Wines in Eastern U.S.A. 25 May 1967, https://oaks.kent.edu/node/3427.