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1261. We'd Better Cache Culture on Far Side of the Moon

1262. Use of Nuclear Weapons Is An Invitation to Disaster

1263. Letter from Joshua Lederberg to Richard W. Lyman

1264. Letter from Sam Peltzman to Joshua Lederberg

1267. Getting Out From Under The Shadow of the Bomb

1268. Remarkable Appeal From Soviet Scientist

1269. Any Kind of Contraception is Probably Not 'Natural'

1270. Letter from Joshua Lederberg to John Fried