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Too difficult for me: Diptera key - one forien language, Dutch - another one;). I'd rather wait for English edition.
By the way. In few weeks I'll make CD copy of both two volume of Diptera of European part of Russia and three volume of Diptera of Far East.
Once Kahis wrote that even without Russian language knowing it is usefull because of numerous illustrations inside.
If somebody need this copy let me know on what adress send it.