Ok, so I've just realized what's in the title.
Quick search with "Aerospace-plane"
https://archive.org/details/aviationweek?tab=collection&query="Aerospace-plane"&sin=TXT
"X-20""Dyna""Soar"
Oh boy, another treasure trove. As if the NRO and CIA archives, plus DTIC, were not already rabbit holes.
Quick search with "Aerospace-plane"
https://archive.org/details/aviationweek?tab=collection&query="Aerospace-plane"&sin=TXT
"X-20""Dyna""Soar"
Oh boy, another treasure trove. As if the NRO and CIA archives, plus DTIC, were not already rabbit holes.