Stamp of the Soviet Union, Yuri Gagarin first man in space. CPA #2560.
Post of the Soviet Union, designer I. Levin, 1961, https://commons.wikimedia.org/wiki/File:1961_CPA_2560.jpg
Featuring translated Soviet documents selected, curated, and annotated by Asif Siddiqi, this collection provides an extraordinary peek into the preparations and implementation of the flight of Yuri Gagarin, the first Soviet cosmonaut, who flew into space in his Vostok spaceship on April 12, 1961. For context and analysis of the sources, see the April 2021 essay by Siddiqi on the Sources & Methods blog, “Declassified Sources on Gagarin.” See also the Digital Archive collection on the Space Race.