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Date: 2011-06-22 11:19:35Hardiness zone Physical geography Alfred Rehder Massachusetts Hardiness Arnold Arboretum Contour line Plantmaps Climate Plants Agriculture | The New USDA Plant Hardiness Zone MapAdd to Reading ListSource URL: arnoldia.arboretum.harvard.eduDownload Document from Source WebsiteFile Size: 509,24 KBShare Document on Facebook |