Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
Klauser, O. 1954. Ein Beitrage zur Kenntnis des Kupferstechers (Pityogenes chalcographus L) in Wellenstein, Die grosse Borkenkaferkalamitat in Sudwestdeutschland 1944-1951 . Ebner, Ulm 1954:285-300.
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