Abella, S.R. 2009a. Tree canopy types constrain plant distributions in ponderosa pine-Gambel oak forests, northern Arizona. Res. Note. RMRS-RN-39. Fort Collins, CO: U.S. Department of Agriculture, U.S. Forest Service, Rocky Mountain Research Station. 7 p.

Abella, S.R. 2009a. Tree canopy types constrain plant distributions in ponderosa pine-Gambel oak forests, northern Arizona. Res. Note. RMRS-RN-39. Fort Collins, CO: U.S. Department of Agriculture, U.S. Forest Service, Rocky Mountain Research Station. 7 p.

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