center verso in graphite: J. Beuys; upper right verso in graphite: 26; stamped in black: (in circle) Hauptstrom
Mr. and Mrs. Herbert Vogel, New York; gift to NGA, 2007.
- Institute of Contemporary Art, Philadelphia, 1975, no cat.
- Painting, Drawing and Sculpture of the '60s and the '70s from the Dorothy and Herbert Vogel Collection, Institute of Contemporary Art, University of Pennsylvania, Philadelphia, 1975: p. 8.
- Schellmann, Jörg. Joseph Beuys: The Multiples. Cambridge: 1997.