Sources

Sources

Sources

Hills, J.L., C.H. Jones, and C. Cutler. 1908. Soil deterioration and soil humus. In Vermont Agricultural Experiment Station Bulletin 135, pp. 142–177. Burlington: University of Vermont, College of Agriculture.

Montgomery, D. 2007. Dirt: The Erosion of Civilizations. Berkeley: University of California Press.

Tegmeier, E.M., and M.D. Duffy. 2004. External costs of agricultural production in the United States. International Journal of Agricultural Sustainability 2: 1–20

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