Revision History for SIR 2011-5036 David R. Wilburn Wind Energy in the United States and Materials Required for the Land-Based Wind Turbine Industry From 2010 Through 2030 ----------------------------------------------------- Posted online June 16, 20111 ----------------------------------------------------- Revised and reposted September 4, 2012 Table A2-1 was revised to remove "Gt, billion metric tons" from the headnotes and replace with "kg, kilograms; kt, thousand metric tons". "Gt" in header row was replaced with "kt".