"first in 1967" . . . "Soyuz 1" . "Soyuz 1 accident" . "1967-04-23" . . . . . . . . . "first mission" . . "first crewed flight" . . "1967-037A" . . . "flight" . . . . "1967-04-24" . . "96472.0" . . . "Soyuz" . . . . "Soyuz 1" . . . "18" . . "1" . "02759" .