The structure of most virgin forests in the western United States reflects a past disturbance history that includes forest fire. James K. Agee, an expert in the emergent field of fire ecology, analyzes the ecological role of fire in the creation and maintenance of natural western forests, focusing primarily on forest stand development patterns. His discussion of the natural fire environment and the environmental effects of fire is applicable to a wide range of temperate forests.
A VERY technical but also very helpful source for a very specific topic. Unfortunately I forget sometimes that Idaho is not often considered part of the Pacific Northwest, so there wasn't as much on the particular region I was hoping to study. Lots of information, however, on the type of forests that that region is made up of, so it was not all in vain.