Frank, K. (1963). The Present Vista for the Vitis Vinifera European Grape Varieties in the East (1–). https://oaks.kent.edu/node/3439
Frank, Konstantin. 1963. “The Present Vista for the Vitis Vinifera European Grape Varieties in the East”. https://oaks.kent.edu/node/3439.
Frank, Konstantin. The Present Vista for the Vitis Vinifera European Grape Varieties in the East. 1 Jan. 1963, https://oaks.kent.edu/node/3439.
Courtesy of Markko Vineyard.