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APOLLO-SOYUZ CREW: THOMAS P. STAFFORD, DONALD SLAYTON, VANCE BRAND,ALEXEI LEONOV and VALERI N. KUBASOVSpace travelers from the joint U.S.-U.S.S.R. mission sign this 14x11 certificate Document signed: "Tom Stafford", "V. Brand", "D.K. Slayton", "A.