Tree swallows, a nationwide sentinel species for assessing and monitoring aquatic contamination.
| Other author | Upper Midwest Environmental Sciences Center (Geological Survey) |
| Format | Electronic |
| Publication Info | 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. |
| Supplemental Content | https://purl.fdlp.gov/GPO/LPS81327 |
| Subjects |
| Variant title | Tree swallows |
| Series | Fact sheet ; FS 2004-3042 Fact sheet (Geological Survey (U.S.)) 2004-3042. ^A466711 |
| General note | Title from PDF title screen (viewed June 17, 2004). |
| General note | "April 2003." |
| Technical details | 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 number | 0621-L (online) |
| Govt. docs number | I 19.127:2004-3042 |