Zweiklang
Subtitle: Sophie Taeuber-Arp, Hans Arp
Series: Sammlung Horizont
Publisher: Verlag der Arche
Published: 1960
Place of publication: Zürich
Language: ger; fre
Number of pages: 104
Notes: Includes writings of Hans Arp (p. 39-104).

Also issued online.

German or French.