1. 1
   Bivoltinism in Ips typographus in Norway and winter mortality in second generation = To generasjoner hos Ips typographus i Norge og vinter-mortalitet i 2. generasjon

   by Austarå, Øystein
   Published 1977

   Ås [Norway] : Norsk institutt for skogforskning, 1977.

   p. [272]-281 : ill. ; 24 cm.

   Subjects: “...Ips typographus Norway....”
   

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2. 2
   Seasonal flight activity and attack pattern of Ips typographus in Norway under epidemic conditions = Svermeforløpet og angrepsmønsteret hos granbarkbillen Ips typographus i Norge u...

   by Bakke, Alf
   Published 1977

   Ås [Norway] : Norsk institutt for skogforskning, 1977.

   p. [256]-268 : ill. ; 24 cm.

   Subjects: “...Ips typographus Norway....”
   

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