File:Runoff of soil & fertilizer.jpg

applies to jurisdiction: United States of America determination method or standard: work of the federal government of the United States determination method

Foundation. Date 11 June 2009 Source CK-12 Foundation at www.ck12.org (See page ii of the book for the license) Author Craig Freudenrich, John Benner, David Bethel

Laboratory.. CC-BY-SA. (7) Soil Erosion. Public Domain. (8) http://commons.wikimedia.org/wiki/File: No_till_farming_SemisDirect_USDA.jpg. Public Domain. (9)

jurisdiction: United States determination method or standard: work of the federal government of the United States determination method or standard: SHA-1

English applies to jurisdiction: United States of America determination method or standard: work of the federal government of the United States