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.
Yellow fever in Philadelphia, 1853: with statistics (continued) : read before the College of Physicians, October 5, 1853
Yellow fever in Philadelphia, 1853: with statistics (continued) : read before the College of Physicians, October 5, 1853