Pavel Popovich was the fourth cosmonaut, flying to space on Vostok 4. He later commanded the Soyuz 14 mission as well.
They hired Steve Zarelli, the world's foremost expert on space signatures, to inspect the cover and confirm that it's a genuine KNIGA release, not a reprint or forgery. This item was signed about 50 years ago, and it has some minor wear/aging as a result. Please refer to the photos for a closer look.
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