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.
Interior view: In the foreground is a man working at a desk. On the desk is a multi-line telephone, a manual typewriter, and a book stand. There is a shelf with index cards above the desk. In the background are low book shelves, book trucks, and women working.
Copyright:
The National Library of Medicine believes this item to be in the public domain. (More information)