. Annual inventory report for Pennsylvania's forests [electronic resource] : results from the first two years. Forest surveys Pennsylvania Statistics; Forests and forestry Pennsylvania Statistics. 2000. 1955 1965 1978 1989 2001 ^ 70 d c -D 60 c « _g 50 E S »- I 30- ^ 20- o ^ 10- c i 0 - o O 4 6 8 10 12 14 16 18 20 22 Diameter Class (inches) Figure 6.—Distribution of growing-stock trees ( inches and larger) per acre of timberland, Pennsylvania, 1965, 1978, 1989, and 2001. Figure 8.—Volume of growing stock per acre of timberland in Pennsylvania by inventory date, 1955, 1965, 1978, 1989, and 2
. Annual inventory report for Pennsylvania's forests [electronic resource] : results from the first two years. Forest surveys Pennsylvania Statistics; Forests and forestry Pennsylvania Statistics. 2000. 1955 1965 1978 1989 2001 ^ 70 d c -D 60 c « _g 50 E S »- I 30- ^ 20- o ^ 10- c i 0 - o O 4 6 8 10 12 14 16 18 20 22 Diameter Class (inches) Figure 6.—Distribution of growing-stock trees ( inches and larger) per acre of timberland, Pennsylvania, 1965, 1978, 1989, and 2001. Figure 8.—Volume of growing stock per acre of timberland in Pennsylvania by inventory date, 1955, 1965, 1978, 1989, and 2001. M differences between bars are statistically significant at 67-percent level. 300 250 - 200 - Z 150 100 - X 1989 2001. 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 Pennsylvania. Bureau of Forestry; McWilliams, William H; United States. Forest Service. Northeastern Research Station. Newtown Square, PA : U. S. Dept. of Agriculture, Forest Service, Northeastern Research Station
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