Prescribed fires do not reduce future area burned in central and southern California: USGS Research Brief

Researchers used 29 years of historical fire mapping to quantify the relationship between annual wildfire area and previous fire area in seven California counties to address the question of prescribed fire effectiveness in these counties. 
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Price, O. F., R. A. Bradstock, J. E. Keeley, and A. D. Syphard. 2012. The impact of antecedent fire area on burned area in southern California coastal ecosystems. Journal of environmental management 113:301-307.