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.
[Washington, D.C.] : Federal Security Agency, U.S. Public Health Service, June 1946 and Distributed: Washington, D.C. : for sale by the Superintendant of Documents, U. S. Government Printing Office