Plant hardiness zone map - National Arboretum (U.S.); American Horticultural Society; United States. Agricultural Research Service (Washington, D.C. : Agricultural Research Service, 1965)
Also shows southern Canada.
Text and adapted version of color map on verso.
"*U.S. Government Printing Office: 1965 OF-782-915."
Keywords: Atmospheric temperature -- United States -- Maps; Atmospheric temperature -- Canada -- Maps; Plants -- Hardiness -- United States -- Maps; Plants -- Hardiness -- Canada -- Maps; United States -- Climate -- Maps; Canada -- Climate -- Maps