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Fig. 3. Ponderosa pine recruitment dates from Monument Canyon Research Natural Area (Muldavin et al. 1995). Dates are estimated from increment cores taken from living trees over 10 cm diameter at breast height and from cross sections taken at root crown from poles in doghair thickets. Because increment cores were taken near ground level but often did not intersect the pith, dates from cores are considered less accurate than dates from cross sections.