Anthrax Probe Scours Tips, Trash, Tabletops In Far-Ranging Quest.

Reports on investigations into anthrax mailed in letters in the United States. Efforts to solve the mystery of where the anthrax came from that killed an elderly woman in Connecticut who had no apparent connection to a post office or media business; Investigation methods, including interviews, analysis of immigrant records, and laboratory work; Details on clues found by investigators.