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Sheet 51
Fischer 2239-2241 and two decorative labels
Eksperimentalny lot "Apollo"-"Sojuz" 1975 = Test flight Apollo-Soyuz 1975.
The Apollo-Soyuz Test Project was the first joint flight of the United States and Soviet space programs. The project took place in July 1975 and entailed the docking of an American Apollo space craft with the Soviet Soyuz 19 space craft.