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Need a statistic on topsoil erosion



Dawn Sawvel <dasawvel@ifai.com> wants to know the following:

Does anyone have a statistic on the amount of topsoil erosion in the 
U.S. and/or worldwide during the past year, two years, five years?

If so, do you have a citation for the source of the figures?

I would appreciate if you could let Dawn know.  She is the editor of a 
magazine on erosion control and needs this info for an article.

Mike Ravnitzky