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1. Fonseca is much cheaper via Royal Entomological Soc., but to buy here is a great headache :D
2. Fonseca is great, but Gregor's (and K) Muscidae of Central Europe is good too.
3. + Fanniidae of Europe (Gregor, Pont, Rozkosny) + the abovememtioned Fonseca for Fanniidae too