Cite This Item
MLA
Arnold Arboretum. Arboretums and botanical gardens in North America ; Hardiness zones: limits of average annual minimum temperatures. [ca. 1950–2012]. Web. 28 Mar 2024. <https://ark.digitalcommonwealth.org/ark:/50959/3j333730m>.
APA
Arnold Arboretum. ([ca. 1950–2012]). Arboretums and botanical gardens in North America ; Hardiness zones: limits of average annual minimum temperatures [Map]. Retrieved from https://ark.digitalcommonwealth.org/ark:/50959/3j333730m
Chicago
Arnold Arboretum. "Arboretums and botanical gardens in North America ; Hardiness zones: limits of average annual minimum temperatures." Map. [ca. 1950–2012]. Digital Commonwealth, https://ark.digitalcommonwealth.org/ark:/50959/3j333730m (accessed March 28, 2024).