This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Volumes.of.the.Allgemeine.Deutsche.Biographie.. Volumes of the public domain Allgemeine Deutsche Biographie The books on the picture have been reprinted without modification between The text therein is in the public domain as are the book titles The design of the cover does not surpass the minimum requirements to be copyrightable