https://www.thesr71blackbird.com:443/History/NASA-YF-12/rss/6981RSS documenthttps://www.thesr71blackbird.com/History/NASA-YF-12/nasa-yf-12-research-programSat, 19 Jul 1969 05:00:00 GMThttps://www.thesr71blackbird.com/History/NASA-YF-12/nasa-yf-12-research-programhttps://www.thesr71blackbird.com/History/NASA-YF-12/propulsion-researchSat, 17 Jul 1971 02:49:00 GMThttps://www.thesr71blackbird.com/History/NASA-YF-12/propulsion-researchhttps://www.thesr71blackbird.com/History/NASA-YF-12/thermal-loads-researchWed, 02 Feb 1972 03:00:00 GMThttps://www.thesr71blackbird.com/History/NASA-YF-12/thermal-loads-researchhttps://www.thesr71blackbird.com/History/NASA-YF-12/landing-studiesMon, 02 Apr 1973 02:58:00 GMThttps://www.thesr71blackbird.com/History/NASA-YF-12/landing-studieshttps://www.thesr71blackbird.com/History/NASA-YF-12/the-cold-wall160experimentSun, 02 Feb 1975 04:00:00 GMThttps://www.thesr71blackbird.com/History/NASA-YF-12/the-cold-wall160experiment