Heimlichen Richter. Libretto. German. Published in Berlin.

von Hugo Friedrich ; Musik von Otto Klauwell. (statement of responsibility)

U.S. RISM Libretto Project.

Legal notice--verso of title page.

Singers' names not given.

operas librettos franz xaver martl anna anastasia wolfgang franz vom mooshof nazi wurzl german berlin albert schatz collection performing arts encyclopedia hugo friedrich otto klauwell verlag von albert ahn heimlichen richter german opera berlin opera opera

1939 - 1945

Library of Congress

https://www.loc.gov/

Public Domain