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

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Bibliographic Details
Imprint:	La Crosse, WI : U.S. Dept. of the Interior, U.S. Geological Survey, Upper Midwest Environmental Sciences Center, [2004]
Description:	2 unnumbered pages : digital, PDF file.
Language:	English
Series:	Fact sheet ; FS 2004-3042 Fact sheet (Geological Survey (U.S.)) ; 2004-3042.
Subject:	Tree swallow -- United States. Water quality biological assessment -- United States.
Format:	E-Resource U.S. Federal Government Document Book
URL for this record:	http://pi.lib.uchicago.edu/1001/cat/bib/6548320

Hidden Bibliographic Details
Varying Form of Title:	Tree swallows
Other authors / contributors:	Upper Midwest Environmental Sciences Center (Geological Survey)
Notes:	Title from PDF title screen (viewed June 17, 2004). "April 2003." 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.
GPO item no.:	0621-L (online)
Govt.docs classification:	I 19.127:2004-3042

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