With 2 etchings by Hans Erni. In the colophon: 6/50. Signed: Erni.
Zurich, Herdeg & Co., 1943. Paperback. 4°;
Werner Heisenberg. Die Naturgesetze und die Struktur der Materie, 1967. With 4 etchings by Hans Erni. On first page with signed pencil drawing by Hans Erni.
Dated dedication.
Stuttgart, Belser Verlag, 1967. Paperback. 8°.
In original slipcase;
Hans Erni. The Israel Sketchbook, 3 Vol, 1968.
In the colophon of Volume II and III signed: Erni. Handwritten numbering: XIV. Geneva, 1968.
All volumes in original slipcase.

Provenance:
Berthe Kofler Erni (sister of Hans Erni);
Swiss private property.

Literature: (Farner) Cramer 5; (Heisenberg) Cramer 43.
(3).