Description
Item Description:Description based on content viewed May 23, 2002; title from web page.
"September 1983."
"FWS/OBS-82/10.57."
Electronic resource.
Physical Description:vi, 37 pages : illustrations ; 28 cm.
Also available in print.
Format:Mode of access: WWW browser and PDF reader. Address as of 6/5/2002: http://www.nwrc.usgs.gov/wdb/pub/hsi/hsi-057.pdf ; current access available via PURL.
Bibliography:Includes bibliographical references.