Mode of access: Internet from the USGS web site. Address as of 8/5/08: http://www.umesc.usgs.gov/documents/fact%5Fsheets/center%5Fhistory.pdf; current access available via PURL.
Note
Title from PDF title screen (viewed on Aug. 5, 2008).
At head of title: Upper Midwest Environmental Sciences Center, La Crosse, Wisconsin.