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From an important Rhineland Beuys collection:
Joseph Beuys: large-format map: The Economic Value Principle, 1980
Principle 1 Heat, Card No.9
signed
color offset
17.2 x 12.4 cm
Publisher: Edition Staeck, Heidelberg
Printing: Steidl, Göttingen
Very good condition, slight adhesive traces from an old mount on the back, see photos.
The photos are part of the condition description.
Signed by Joseph Beuys with red felt-tip pen, full name: "Joseph Beuys"
Lit.: Neuhaus p.68 and p.185