1. Forest Inventory and Analysis database
2. Nelson, Mark; Liknes, Greg; Perry, Charles H. 2009. Combining forest inventory, satellite remote sensing, and geospatial data for mapping forest attributes of the conterminous United States. In: McWilliams, Will; Moisen, Gretchen; Czaplewski, Ray, comps. Forest Inventory and Analysis (FIA) Symposium 2008; October 21-23, 2008; Park City, UT. Proc. RMRS-P-56CD. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. 9 p.
3. Gergely, K.J.; McKerrow, A. 2016. PAD-US—National inventory of protected areas (ver. 1.2, December 2020): U.S. Geological Survey Fact Sheet 2013–3086. 2 p. https://pubs.usgs.gov/fs/2013/3086/
4. Intergovernmental Panel on Climate Change [IPCC]. 2014. Climate change 2014: Synthesis report. Fifth Assessment Report: Contribution of Working Groups I, II and III to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change. Geneva, Switzerland: Intergovernmental Panel on Climate Change. 151 p. [Accessed 16 December 2019]. https://ar5-syr.ipcc.ch
5. Future scenarios