AUTHOR.

(Photo:Soyuz 9 on the 1971 USSR commemorative stamp "424 hours On Earth's Orbit"

USSR Post - New stamp: Scanned 600 dpi by User Matsievsky from personal collection. Old stamp: Personal collection. Scanned and processed by Andrei Sdobnikov

USSR stamp: Cosmonauts Andriyan Nikolayev and Vitaly Sevastyanov, Soyuz 9. Series: 424 Hour Space Flight of Soyuz 9, June 1–19

Public Domain

File:The Soviet Union 1970 CPA 3907 stamp (Cosmonauts Andriyan Nikolayev and Vitaly Sevastyanov, Soyuz 9).jpg

Created: 7 July 1970 )

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Unexplained manned Soyuz fail & What is to be done? Bob Zimmerman BehindtheBlack.com

https://behindtheblack.com/behind-the-black/points-of-information/soyuz-upper-stage-fails-forces-emergency-landing-of-manned-capsule/