PT - JOURNAL ARTICLE AU - Joe A. Friend TI - Achieving soil sustainability DP - 1992 Mar 01 TA - Journal of Soil and Water Conservation PG - 156--157 VI - 47 IP - 2 4099 - http://www.jswconline.org/content/47/2/156.short 4100 - http://www.jswconline.org/content/47/2/156.full