In the Windgällen area
Watercolor. Test for the painting of the relief model. 1938. 22 x 20 cm.
(Imhof, Eduard H 3)

Drusentürme, Südwand (Rätikon)
Pencil. 2. Okt. 1934. 26 x 21 cm.
(Imhof, Eduard H 43)

Kreuzberge in the Säntis Mountains
Pencil. 1946. 29 x 42 cm.
(Imhof, Eduard H 23)

The Altmann in the Säntis Mountains
Pencil. 1946. 29 x 42 cm.
(Imhof, Eduard H 14)

Grosse Windgällen from the South
Pencil. Sept. 7, 1937. 22 x 21 cm.
(Imhof, Eduard H 7)

Windgällen
Charcoal on tracing paper. 1939. This drawing was presented at the Swiss National Exhibition 1939 in Zurich to explain stereoscopic viewing. 57 x 59 cm.
(Imhof, Eduard H 4)