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| A cover featuring a Soyuz 18 stamp, produced by KNIGA, and postmarked on September 12, 1975. It is signed by Pyotr Klimuk and Vitaly Sevastyanov. |
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| A cover illustrating Soyuz 18 docked with the Salyut 4 space station on May 25, 1975, signed by Pyotr Klimuk and Vitaly Sevastyanov. |
