- Data source
- Little, Elbert L., Jr. 1971. Atlas of United States trees. Volume 1.
Conifers and important hardwoods. Miscellaneous Publication 1146.
Washington, DC: U.S. Department of Agriculture, Forest Service. 9 p.,
illus. [313 maps, folio].
Harvested on Fri May 23 09:41:25 MDT 2014 from Data Basin Service