Iīm in Finland now(so I obviously like Finland and am rather biast) and I know itīs not exactley on the top of the world list for literature, but two books that I feel classical represent Finland and are an asset fo any classical library are:
The Kalevala (which is cool for all you Tolkien fans, It plays a major part in his writing)
The Seven Brothers by Alexander Kivi
I am makeing it my mission in life to bring to light the grand accomplishment of Suomi(Finland)
Elä Kon (I might miss spelled that, but it is pronunced elaah cone, with a very think o noise) or Hooray For Finland
P.s I also have no idea how the whole copyright thing works thouhg the Kalevala is so old I canīt imagine that being a problem