Description
Item Description:Title from title screen (viewed on Jan. 8, 2009).
"September 1983."
"FWS/OBS-82/10.40."
Electronic resource.
Physical Description:vi, 22 pages : digital, PDF file.
Format:Mode of access: Internet from USGS web site. Address as of 1/8/2009: http://www.nwrc.usgs.gov/wdb/pub/hsi/hsi-040.pdf ; current access available via PURL.
Bibliography:Includes bibliographical references (pages 21-22).