An official website of the United States government
Here's how you know
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.
Pedestrian evacuation modeling by USGS geographers Nathan Wood and Jeanne Jones and Sacramento State University is featured in a story about vertical...
Pedestrian evacuation modeling by USGS geographers Nathan Wood and Jeanne Jones and Sacramento State University is featured in a story about vertical...