Reading comprehension fail.
I said "believe the story summary implicitly", meaning that "[t]urns out one survived" would be exactly that -- one single solitary copy.
It's not quite clear as to who owns the work, so the word "declassified" might be a marketing ploy. In fact, I'm fairly certain that this particular work is not owned by the government, but instead has incorporated from a work owned by the government within, and added some stuff to make it original -- much like the GPL.
Getting the material itself may be free, but you may have to to pay an administrative fee, sure ok I'll split hairs too. The thing is, books are cheap to print. The list price on this is $25. If this is owned by the government, then that's a pretty darn good profit to turn for a printing fee.