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Yes it is expensive but is is pretty good and although it is nonminally only for central Europe, it is eminently usable for other parts of Europe. I have being using it in combination with Fonseca 1968 and some journal articles to identify flies I have caught here in southern England. Fonseca is very out of date but it can get you started. You can downlod a copy here: https://www.royen...-muscidae/