%0 Government Document %0 Online %0 Book %A Rostad, Colleen E. %E Rutherford, David W. %I U.S. Dept. of the Interior, U.S. Geological Survey %D 2011 %C Reston, Va. %G English %B Fact sheet (Geological Survey (U.S.)) ; %T Biochar for soil fertility and natural carbon sequestration %U http://purl.fdlp.gov/GPO/gpo20872