https://www.space.com/20529-space-history-photo-nasa-hl-20-lifting-body.html
Space History Photo: NASA HL-20 Lifting Body | Space
Apr 5, 2013 - This non-flying, full-scale mockup of the HL-20 lifting body was used for various tests of maintainability and human factors considerations.
nasa hl 20space historyphotoliftingbody