Description
Item Description:Title from title screen (viewed on Sept. 11, 2008).
"August 1985."
Electronic resource.
Physical Description:vi, 21 pages : illustrations, 1 form, 1 map ; 28 cm.
Format:Mode of access: Internet from USGS web site. Address as of 9/11/08: http://www.nwrc.usgs.gov/wdb/pub/hsi/hsi-101.pdf ; current access available via PURL.
Bibliography:Includes bibliographical references (pages 18-21).