Official websites use .gov A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Periodical. Lederberg, Joshua. "Ample Evidence for Taking the Lead Out of Gasoline." Washington Post, (17 January 1970). Article. Newspaper Column. 1 Image.. Washington Post. Lederberg UI. S190