Tree swallows, a nationwide sentinel species for assessing and monitoring aquatic contamination.

Bibliographic Details
Corporate Author: Upper Midwest Environmental Sciences Center (Geological Survey)
Format: Government Document eBook
Language:English
Published: La Crosse, WI : U.S. Dept. of the Interior, U.S. Geological Survey, Upper Midwest Environmental Sciences Center, [2004]
Series:Fact sheet (Geological Survey (U.S.)) ; 2004-3042.
Subjects:
Online Access:https://purl.fdlp.gov/GPO/LPS81327
Description
Item Description:Title from PDF title screen (viewed June 17, 2004).
"April 2003."
Electronic resource.
Physical Description:2 unnumbered pages : digital, PDF file.
Format:Mode of access: Internet from the UMESC web site. Address as of 5/08/07: http://www.umesc.usgs.gov/documents/fact%5Fsheets/swallows.pdf ; current access is available via PURL.