1. 1. US Department of Energy. US Billion-Ton Update: Biomass Supply for a Bioenergy and Bioproducts Industry. R.D. Perlack and BJ Stokes (Leads), ORNL/TM-2011/224. Oak Ridge National Laboratory, Oak Ridge, TN. 2011; 227. https://www.energy.gov/sites/default/files/2015/01/f19/billion_ton_update_0.pdf
2. 2. Langholtz MH. personal communication. January 2023.
3. 3. US Department of Energy. Billion-Ton Report: Advancing Domestic Resources for a Thriving Bioeconomy, Volume 1: Economic Availability of Feedstocks. MH Langholtz, BJ Stokes, LM Eaton (Leads), ORNL/TM-2016/160. Oak Ridge National Laboratory, Oak Ridge, TN. 2016; 448. doi: 10.2172/1271651. http://energy.gov/eere/bioenergy/2016-billion-ton-report.
4. 4. Lepage T, Kammoun M, Schmetz Q, Richel A. Biomass-to-hydrogen: A review of main routes production, processes evaluation, and techno-economical assessment, Biomass and Bioenergy. 2021; 144: 105920; 0961-9534. https://doi.org/10.1016/j.biombioe.2020.105920.
5. 5. A separate database containing the disaggregated biomass supplies by county and state is available through a Web-based Bioenergy Knowledge Discovery Framework (http://bioenergykdf.net) for users to capture, visualize, and analyze information on the complete bioenergy supply chain and the infrastructure needed to support that chain (ORNL, 2010).