McNab & E. A. Avers, 1994
McNab, W. H., and E. A. Avers. 1994. Ecological Subregions of the United States. Washington, DC: USDA Forest Service, Washington Office.| Medium type | Book |
| Author | McNab, W. H., and E. A. Avers |
| Title | Ecological Subregions of the United States |
| Publication Location | Washington, DC |
| Publication Company | USDA Forest Service, Washington Office |
| Publication Date | 1994 |
