About HEIS
Getting Started
Guide to the Map
About the Data
FAQ
About the Data
 

Metadata, "data about the data", is information that will help you better understand the data displayed on the maps, and includes information about the quality, source, and content of the data. To access metadata, click on the data layer you are interested in and the metadata will open in a new window.

 

Google
Silent Spring Institute
E-resources website
The e-resources website was made possible by
a grant from the National Library of Medicine
Go to the NLM website