[Syrphidae] Publication of Stackelberg 1952

[Gerard Pennards]

Dear All,
Can someone share the following publication with me?
That would be great, thanks in adbvnce!
kind regards,
Gerard
Stackelberg, A. A. (1952) Novye Syrphidae (Diptera) palearkticheskoy fauny. Trudy Zool. Inst. Leningrad., 12, 350-400.
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