. Current topics in forest entomology : selected papers from the XVth International Congress of Entomology, Washington, , 1976. Forest insects Congresses. t r ~i 1 1 1 UJ ZD _J UJ < o UJ cr o o <. 10 ~20 30 AO 50~ 60 ~70 80 90~ 100 YEARS Figure 9.—An example of time traces of three selected indicators and their aggregate. 98. 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 International Congress of Entomology (15t
. Current topics in forest entomology : selected papers from the XVth International Congress of Entomology, Washington, , 1976. Forest insects Congresses. t r ~i 1 1 1 UJ ZD _J UJ < o UJ cr o o <. 10 ~20 30 AO 50~ 60 ~70 80 90~ 100 YEARS Figure 9.—An example of time traces of three selected indicators and their aggregate. 98. 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 International Congress of Entomology (15th : 1976 : Washington, D. C. ). Washington : United States Dept. of Agriculture, Forest Service
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