[Syrphidae] Die mitteleuropäischen Arten der Gattung Volucella

[lasiopa at bknet.dk]

Dear all, 

 

does anybody know where get the original German version of the dissertation
of Leo Rupp, “Die mitteleuropäischen Arten der Gattung Volucella” from 1989?

 

Kind regards

Leif Bloss Carstensen

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