SR-71 Blackbird walkaround
61-7976 was flight-delivered to the (then) Air Force Museum in March 1990, several months after the SR-71's initial retirement. This aircraft had carried out the first operational Blackbird sortie by the USAF in March 1968 (after of course, the CIA's A-12s); -7976 ultimately flew more operational missions than any other Blackbird.
YF-12A walkaround
SR-71 reading:
Bob Archer "Giant Reach: The Lockheed SR-71 in East Anglia, 1974-90" American Cold War Stories
Robert Hopkins III Strategic Air Command in the UK: SAC Operations 1946-1992 Detailed coverage of SR-71 operations from England.
"SR-71 Shows Striking Similarities to YF-12A" Aviation Week & Space Technology December 14, 1964 p.20-21 5 photos
Richard G. O'Lone "First Operational SR-71 Delivered to SAC" Aviation Week & Space Technology January 17, 1966 p.33-34 3 photos
Photo: "Modified Boeing 747 in refueling tests with USAF/Lockheed SR-71" Aviation Week & Space Technology October 2, 1972 front cover
Photos (3): "Second SR-71 Deployed to England" AW&ST January 31, 1983 p.59
"SR-71 Sets Four Records During Retirement Flight" Aviation Week & Space Technology March 12, 1990 p.25
Michael O'Leary "Bad Day At Blackbird Central" Air Combat May 1990 p.42-53 15 photos
Brian Shul "Lasting Legacy" Journal of American Military Aviation V2 N1 p.16-17 4 photos
Christopher Michaels "Beyond The Horizon" Airpower September 1993 p.10-55 74 photos
"SR-71 permanently retired" World Air Power Journal Vol.35 Winter 1998 p.15
"Bye Bye Blackbird Again" USAF Yearbook 1998 p.50-52 11 photos