vi, 101 pages : color illustrations, maps (some color) ; 28 cm
OCLC
ocm53949821
One folded map in pocket.
Includes bibliographical references (pages 20-21).
Also available via Internet at the USGS web site. Address as of 02/28/04: http://water.usgs.gov/pubs/wri/wri034188/; current access available via PURL.