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.
(A) Study location in North America. (B) Study location in Eastern Ontario, Canada, and outline of the South Nation River basin, as well as sample locations (small white dots). (C) Map of the CTD and UCTD watersheds and water sample locations.
