HL-20 Personnel Launch System: differenze tra le versioni
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*{{cite web|url=http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19940030181_1994030181.pdf|title=Launch-Pad Abort Capabilities of the HL-20 Lifting Body|publisher=NASA}}
*{{cite web|url=http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19910006695_1991006695.pdf|title=Design and Fabrication of the NASA HL-20 Full Scale Research Model|publisher=NASA}}
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