図書館員の皆様、 日本語の本や雑誌等、資料がどれほどヘルシンキ、又は、トゥルクの図書館にあるかどうか知りたいのですが、教えて頂けますでしょうか？

Ask a Librarian provides answers in three languages: Finnish, Swedish and English. Ques-tions in other languages can only be answered if there happens to be a person available who is capable of giving professional service in that language. About Ask a Librarian see also,
http://www.libraries.fi/en-GB/ask_librarian/about/ .