Das geheime Königreich
Subtitle: Märchenoper in einem Akt (zwei Bildern) ... Op. 50
Publisher: Universal-edition
Published: 1928
Place of publication: Wien
Language: ger
Number of pages: 24
Subjects: Operas; Librettos
Work titles: Geheime Königreich
Notes: Libretto.

Music also composed by Křenek.