RT Journal Article SR Electronic T1 Managing U.S. cropland to sequester carbon in soil JF Journal of Soil and Water Conservation FD Soil and Water Conservation Society SP 374 OP 381 VO 54 IS 1 A1 R. Lal A1 R. F. Follett A1 J. Kimble A1 C. V. Cole YR 1999 UL http://www.jswconline.org/content/54/1/374.abstract AB