While I would encourage you to visit their website and look at some of the other maps they have (for example the wind energy potential and thermal energy maps are impressive), here is the map for biomass resources by county. The map estimates the biomass resources currently available in each county and includes the following energy resource categories: crop residues (5 year average: 2003-2007) forest and primary mill residues (2007), secondary mill and urban wood waste (2002), methane emissions from landfills (2008), domestic wastewater treatment (2007), and animal manure (2002).
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