USGS Western Ecological Research Center publication brief.
There appears to be no indication that the frequency and severity of large fires have changed from historical fire regimes on landscapes as diverse as Rocky Mountain conifer forests and southern California chaparral.
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Keane, R. E., J. K. Agee, P. Fule, J. E. Keeley, C. Key, S. G. Kitchen, R. Miller, and L. A. Schulte. 2008. Ecological effects of large fires on US landscapes: benefit or catastrophe. International Journal of Wildland Fire 17:696-712.