Kansalliskirjasto 

The National Library of Finland is the oldest and largest scholarly library in Finland. It is responsible for the collection, description, preservation and accessibility of Finland’s published national heritage. The digital collections include Finnish newspapers but also other printed material and manuscript collections. Learn more.

Finna

Finna.fi is a search service that collects material from hundreds of Finnish organisations under one roof. It includes material that is available online in a variety of formats. You can also search for information from library and archive material that has not been digitised or with limited access.
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Suomen vanhat kartat (historical maps)

Information on cartographic materials relating to Finland, collected by the National Land Survey of Finland.