(ASA) Crop Science Society of America (CSSA) SoilScience Society of America (SSSA) European Society for Agronomy The National Agricultural Library (NAL)
1007/978-94-011-5270-9_3. Skjemstad, Jan O. Charcoal carbon in U.S. agricultural soils. SoilScience Society of America Journal. 2002, 66 (4): 1249–1255. doi:10