Ingo. Libretto. German Opera. Public domain libretto, Library of Congress

nach dem gleichnamigen Roman Gustav Freytags von M.F. [i.e. Martha Friedemann] ; in Musik gesetzt von Philipp Rüfer. (statement of responsibility)

U.S. RISM Libretto Project.

Price on title page: 50 Pfg.; legal notices--title page and verso; "Als Manuscript gedruckt"--verso of title page; "Druck von C.G. Röder in Leipzig"--p. 40.

Libretto by Martha Friedemann--Stieger. Opernlexikon.

Performers' names not given.

operas librettos ingo bisino gisela answald gundrun irmgard frieda wolff berthar volkmar german berlin albert schatz collection performing arts encyclopedia gustav freytag martha albertine friedemann berlin sw in commission bei p thelen philippe barthélemy rüfer opera german opera

1550 - 1610

Library of Congress

https://www.loc.gov/

Public Domain