Please guide me to the best source on Finnish designers - (dates etc.) available on the Internet - Authority file ?
A good source for finnish designers is http://www.finnishdesign.fi/home
On the left of this page in blue: "About us", you can find more information. For example DESIGN MUSEUM has very good pages under this file.
LINKS is also good to look at. Gallery has some older designers featured.
On the whole these pages have a lot of information about Finnish design and designers.