PT  - JOURNAL ARTICLE
AU  - Karlen, Doug
TI  - Visual Soil Assessment., Volumes 1–4
DP  - 2001 Oct 01
TA  - Journal of Soil and Water Conservation
PG  - 270--271
VI  - 56
IP  - 4
4099  - http://www.jswconline.org/content/56/4/270.short
4100  - http://www.jswconline.org/content/56/4/270.full