nymph flyes/fishing

Hi,

Can anyone here recommand any thorough books/videos with nymph fishing/nymph
tying? I'd like to get into the details with the different families/species
and the different fishing techniques. Also a guideline on what kind of gear
is the best for different situations.

I live in Denmark, Europe, so books about insects which is only native to
amerika, is of minor interest at this point of time. )




Thank you in advance
Thomas Schreiber