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Re:Are Humans Fit for Space? A ‘Herculean’ Study by varjag on Wednesday December 25, 2019 @05:26PM (#21880826)
Not sure. I got mine off eBay as memento, having read it back in school days many years ago. Very much identical to this lot:

https://www.ebay.com/itm/1955-Traveling-in-Space-M-Vasilev-R...

There's also an expanded post-Sputnik edition of it I think.

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