. Bark beetle risk in mature ponderosa pine forests in western Montana. Bark beetles Montana; Ponderosa pine Diseases and pests Montana. Figure 4. --Variation in the mean nimber and gross board-foot volume of overstory sawlog- size ponderosa pine trees per aore on 25 plots in western Montana. The horizontal position of the plots is not necessarily the same in the upper and lower histograms. 10. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble t
. Bark beetle risk in mature ponderosa pine forests in western Montana. Bark beetles Montana; Ponderosa pine Diseases and pests Montana. Figure 4. --Variation in the mean nimber and gross board-foot volume of overstory sawlog- size ponderosa pine trees per aore on 25 plots in western Montana. The horizontal position of the plots is not necessarily the same in the upper and lower histograms. 10. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Johnson, Philip C. (Philip Cornwell), 1907-; Intermountain Forest and Range Experiment Station (Ogden, Utah) 1n. Ogden, Utah : Intermountain Forest & Range Experiment Station, Forest Service, U. S. Dept. of Agriculture
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