For more on Crossfield, including the story of his barefoot landing, check out his autobiography "Always Another Dawn."
My book, "Breaking the Chains of Gravity," is out in the UK on October 22 and in the US (and Canada I think!) on January 12! Preorder your copy on Amazon!
And there's a lot more Vintage Space over on Popular Science.
And connect on Facebook, Google+, Instagram, and Twitter as @astVintageSpace.