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Muscidae - I see that there is a copy of Fonseca's RES key to Muscidae on Abebooks (from Bookbarn International in Bristol, England) - but they are charging £99 (=108 Euros) for it!!!!
Personally I think charging that much for scientific knowledge is disgusting. :( I hope they never sell it! In the meantime, perhaps we should find out if the RES will support the production of a pdf version of this key until another edition is produced.