4 ms·
Link to 1978 HEXAGON overview, declassified Sep 17: http://www.nro.gov/foia/declass/GAMHEX/HEXAGON/52.PDF http://www.nro.gov/foia/declass/GAMHEX/HEXAGON/52.PDF
by mef 15y ago
Link to 1978 HEXAGON overview, declassified Sep 17: http://www.nro.gov/foia/declass/GAMHEX/HEXAGON/52.PDF http://www.nro.gov/foia/declass/GAMHEX/HEXAGON/52.PDF