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:
Design for Act Wolf's Glen of 'Der Freischtz' Weimar NGOp. Der Freischtz by Carl Maria von Weber as performed in in Weimar Germany User scan of Sadie Stanley ed The New Grove Dictionary of Opera London Macmillan ISBN Credit Staatliche Kunstsammlungen Weimar Karl Lieber Carl August Schwerdgeburth figures PDold Der Freischtz