From the National Library of Finland:
The Fennica National Bibliography is a database of Finnish publications maintained by the National Library of Finland. Fennica has been published as open data using the CC0 license, which allows free use for any purpose, for example in applications and data visualizations.
The Finnish national bibliography contains metadata about:
- Finnish books since 1488
- serial material, including journals since 1771
- maps since the 1540’s
- audiovisual materials
- digitized old collections
- topical index of the ephemera collection
- index of thematic web harvests since 2008
- advance notices of upcoming publications from publishers
- a selection of electronic books since 2008
The service contains information about one million Finnish works. You can browse the data with a user interface at http://data.nationallibrary.fi. Every work, person, organization, place, and subject is shown as a page, which are linked to each other with relationships. For example, a work usually has an author (a person) and an instance (an edition or a version) of a work usually has a publisher (an organization). There are circa 2 million of such pages in the service.