Description
Item Description:Shipping list numbers: 2001-0239-P.
Physical Description:iv, 22 pages : illustrations, color map ; 28 cm.
Format:Mode of access: Internet from the USGS web site. Address as of 10/23/08: http://pubs.usgs.gov/wri/wri014010/pdf/01-4010.pdf; current access available via PURL.
Bibliography:Includes bibliographical references (page 22).