Analysis of Factors Controlling Soil Carbon in the Conterminous United States Guo, Yinyan ; Gong, Peng ; Amundson, Ronald ; Yu, Qian Abstract Publication: Soil Science Society of America Journal Pub Date: 2006 DOI: 10.2136/sssaj2005.0163 Bibcode: 2006SSASJ..70..601G