Inscription
lower left in graphite: Solitude; lower right in graphite No4 Ed 25 / Karl Schrag, 52
Bibliography
- 1971
- Freundlich, August L. Karl Schrag: A Catalogue Raisonné of the Graphic Works 1939-1970. Syracuse: Syracuse University, 1971.
- 1989
- Devon, Marjorie and Peter Walch. Catalogue Raisonne: Tamarind Lithography Workshop, Inc. 1960-1970. Albuquerque, New Mexico: 1989
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