Map by Mark P. Widrlechner, USDA-ARS North Central Regional Plant Introduction Station, Ames, Iowa,
as an adaptation of climatic data published in:

Prikhot'ko, G.F. (ed.) 1968. Klimaticheskii Atlas Ukrainskoi SSR.
Gidrometeorologicheskoe Izdatel'stvo, Leningrad.

Graphic design by Rex Heer, Iowa State University.

For more information please contact Dr. Widrlechner at 515-294-3511, 
      or send e-mail messages to Mark.Widrlechner@ars.usda.gov.