Bellaire, TX: Tro’i Nam, 1991, 1992. Two volumes (of series that continued for three more installments); 338 and 401p., respectively, in shelfworn wraps with owner's name label on flyleaves. Two line maps and a photo showing author Duong working at a map of the tunnels in Saigon in 1970.
On the tunnels of Cu Chi, used as a literal underground network by Viet Cong guerrillas during the war. Text in Vietnamese.