A map showing the decline and retreat of the Breton Language (in Dutch)
From the German version, made by <a href="//commons.wikimedia.org/wiki/User:Migdejong" title="User:Migdejong">Mig de Jong</a>
No machine-readable author provided. <a href="//commons.wikimedia.org/wiki/User:Migdejong" title="User:Migdejong">Migdejong</a> assumed (based on copyright claims).
No machine-readable source provided. Own work assumed (based on copyright claims).