Cite This Item
MLA
Arnold Arboretum. Hardiness zones of the United States and Canada. July 1, 1948. Web. 24 Apr 2024. <https://ark.digitalcommonwealth.org/ark:/50959/3j333722x>.
APA
Arnold Arboretum. (July 1, 1948). Hardiness zones of the United States and Canada [Map]. Retrieved from https://ark.digitalcommonwealth.org/ark:/50959/3j333722x
Chicago
Arnold Arboretum. "Hardiness zones of the United States and Canada." Map. July 1, 1948. Digital Commonwealth, https://ark.digitalcommonwealth.org/ark:/50959/3j333722x (accessed April 24, 2024).