In a USGS Report the authors discuss that an unintended results of fuel modification programs can be the introduction and spread of nonnative invasive plant species.
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Merriam, K. E., Keeley, J.E., and Beyers, J.L., 2007. The role of fuel breaks in the invasion of nonnative plants. U.S. Geological Survey Scientific Investigations Report 2006-5185, 69 p.