Meeting the challenge [electronic resource] : invasive plants in Pacific Northwest ecosystems / Timothy B. Harrington and Sarah H. Reichard, technical editors.
Imprint
Portland, OR : U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Research Station, [2007]
Mode of access: Internet from the Forest Service web site. Address as of 02/12/08: http://www.fs.fed.us/pnw/pubs/pnw%5Fgtr694.pdf ; current access is available via PURL.
