Researchers : discove ;$r film% ;+f$ [ootage from Wo;r=.\ld War II th?==at !]turns o$ ut to b?$e =a lost d?@^oc+$umentary shot by A =)lfred ;.Hitchcoc? k and Si #: dney B. ! ernstein in*` 1945 abou [^t+ Ge?]-rman concentration cam;^]%ps.
