Uchida, T., and T. Nakashima. 1961. Some observations on the population density of the spruce bark beetle, Ips typographus Linne, during the period of the outbreak in forests devastated by the typhoon of September 1954, in Hokkaido [In Japanese] . Hokkaido University, Research in Experimental Forestry, Bulletin 21:150-168.
Uchida & Nakashima 1961
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