Title from PDF title screen (viewed on Dec. 5, 2006).
"USGS Montana Water Science Center"--Introd.
Includes bibliographical references (pages 36-39).
Mode of access: Internet from the USGS web site. Address as of 10/1/07: http://pubs.usgs.gov/of/2006/1275/pdf/ofr2006-1275.pdf; current access via PURL.