00447nam 2200169z- 450 9910712317103321(CKB)5470000002492965(EXLCZ)99547000000249296520230509c2019uuuu -u- -engKorea: Twin TunnelsArmy University PressFort Leavenworth, KanKoreaBOOK9910712317103321Korea: Twin Tunnels3255668UNINA