Stiftung Preußischer Kulturbesitz
Some historical documents about earlier period of the Līva river and the city Liepāja are found in Lehnbriefs acts, written in Latin language and are available from the Marburg Herder Institute, mostly in the Bauer’s German translation of the 16th century and are stored in Geheime Staatsarchiv Preußischer Kulturbesitz managed by the Prussian Cultural Heritage Foundation.