For more on the Dyna-Soar program, check out this blog post that goes through the program in some detail: http://www.popsci.com/space-plane-wasnt-everything-you-never-needed-know-about-dyna-soar
And for more details on Armstrong's launch abort manoeuver using the Skylancer, check out this old video!
I get into this story, or at least the beginning of it, in my book, Breaking the Chains of Gravity, which is coming out on October 22 in the UK and January 12 in the US and Canada... and Australia and India at that point I think, too! (Pre)Order it on Amazon.
And there's a lot more space history on the blog.
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