iv, 33 pages : color illustrations, color maps ; 28 cm
OCLC
ocm51252173
Includes bibliographical references (pages 31-33).
Also available via Internet at the USGS web site. Address as of 01/14/03: http://water.usgs.gov/pubs/wri/wri02-4223/pdf/WRIR02-4223.pdf ; current access available via PURL.