iv, 10 pages : illustrations (some color), color map ; 28 cm
General Note:
Shipping list no.: 2003-0269-P.
Additional Physical Form:
Also available via Internet at the USGS web site. Address as of 03/27/04: http://or.water.usgs.gov/pubs/WRIR03-4099/wri03409 9.pdf; current access available via PURL.