Bibliography and Citations

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Oliver WW, Ryker RA.  1990.  Pinus ponderosa Dougl. ex Laws. Ponderosa pine. Silvics of North America.  Volume 1. Conifers.  Burns RM, Honkala BH, editors. Washington (DC): U. S. Forest Service.    Available from http://na.fs.fed.us/spfo/pubs/silvics_manual/Volume_1/pinus/ponderosa.htm