Natural tree regeneration after clearcutting in Arizona's Ponderosa pine forest microform : two long-term case studies / Peter F. Ffolliott and Gerald J. Gottfried (USDA Forest Service research note RM ; 507)
Natural tree regeneration after clearcutting in Arizona's Ponderosa pine forest microform : two long-term case studies / Peter F. Ffolliott and Gerald J. Gottfried