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Have been searching the forum for previous threads about literature covering Diptera in northern Scandinavia, but could not find anything (?). The place I live in is at 67 degrees north (Bodø, northern Norway), is there any literature covering all species this far north?

Not sure which families looks most interesting, seems that most of the species I observe are Muscidae or Anthomyiidae, but seems like these are complicated families...? Would be nice to be able to identify these to family at least, most of my unidentified species are likely in these families (only 6-7 species not identified to family till now, not posted these yet in the forum).
Already have litterature covering Syrphidae (Nationalnyckeln), are there any other books that are recommended? Don't have much experience with identifying Diptera, certainly not to species-level.

My interests in insects are very general, have tried to find literature for Dytiscidae and Tenthredinidae, but books for these families are very expensive (often more than 100 euros, think that's a little too much!). And also very complicated, with few illustrations... Like books with lots of illustrations, and best if it's in colours too (easier to ID from photos). Even if I bring specimens home, I still photograph them, don't have any good microscopes or similar.