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Purple Cows 17A is a small piece by Warhol that features twenty stamped purple cows that is smaller than a piece of printer paper. Underneath the purple cows, the name Andy Warhol is also stamped. This was the only time Warhol used a rubber stamp in print medium. This piece was part of a group bound portfolio entitled Stamped Indelibly. The other artists that were featured in the Stamped Indelibly portfolio were: Robert Creeley, Allen Ginsberg, Red Grooms, Robert Indiana, Allen Jones, Kenneth Koch, Josef Levi, Roy Lichtenstein, Gerard Malanga, Marisol (Marisol Escobar), Claes Oldenburg, Peter Saul, Andy Warhol, Tom Wesselmann and John Willenbecher.