PUBLIC HEALTH SCIENCE STUDY. BRAIN DRAIN-- THE VIEW FROM THIS SIDE OF THE ATLANTIC BY DSG. TOBACCO REPORT: AGENCIES PONDER ACTION; CONGRESS TAKES THE LEAD WITH A $5-MILLION RESEARCH PLAN, BY WALSH J. SUBWAYS AND SCIENCE: TWO N.Y. INSTITUTIONS CONSIDER MEANING OF COEXISTENCE IN CROWDED MANHATTAN,BY LANGER E.