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Invitation to the press briefing for “9 Evenings: Theater and Engineering,” to be held at Robert Rauschenberg’s 381 Lafayette Street studio. Signed by Alex Hay, Deborah Hay, Steve Paxton, Cecil Coker, Billy Klüver, Peter Hirsch, Per Biorn, Bob Kieronski, Bob Rauschenberg, Öyvind Fahlström, L.J. Robinson, Yvonne Rainer, Lucinda Childs, David Tudor, Fred Waldhauer, John Cage, Dick Wolff, and possibly Robert Whitman