This episode's headline: Troubled Partnership; View From Baghdad; Crude Weapon; Terrorism Alert. The guests include JERRY HOUGH, Soviet Affairs Analyst; NINA BELYAEVA, Soviet Reform Activist; JAMES BILLINGTON, Librarian of Congress; ADM. JOHN D. COSTELLO, U.S. Coast Guard (Ret.); JOHN GALLAGER, Oil Spill Consultant; CORRESPONDENTS: CHARLAYNE HUNTER-GAULT; CAROLYN KERR; JEFFREY KAYE. Byline: In New York: ROBERT MacNeil; In Washington: JAMES LEHRER