Soil erosion in american is?
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Soil erosion in the United States has been a matter of public concern since the 1930s. ... Quantification of the problem has been elusive, and average annual U.S. cropland soil erosion losses have been given as 2 billion (8), 4.0 billion (9, 10), 4.5 billion (5), 4.8 billion (11), 5 billion (6), or 6.8 billion tons (12)
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