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footnote 418
| Title | footnote 418 |
| Publication Type | Miscellaneous |
| Year of Publication | 2009 |
| Authors | various |
| Notes | Agricultural Research Service, 1990: USDA Plant Hardiness Zone Map. Agricultural Research Service, Washington, D.C., 1 map. Arbor Day Foundation, 2006: Hardiness Zones. [Web site] The Arbor Day Foundation, Nebraska City, NE. |
| Reference number | 418 |
| Citation Key | 418 |