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I've understood from our one and only Finnish Tipulidae/Limoniidae-specialist, that it means at least a day in the library beside a copying machine. The more recent literature is most likely scattered in many articles and revisions.

The literature as well as species lists seem to be generally sparser and a lot harder to collect in gnats than in flies.

But I would also feel slightly interested if there were recent European revisions in at least some of the Nematocera groups. At least there is a good Russian publication of Mycetophilidae (by Zaitsev) in the Helsinki museum.