x, 76 pages : illustrations (some color), color maps ; 28 cm.
General Note:
Shipping list no.: 2003-0230-P.
Additional Physical Form:
Also available via Internet at the USGS web site. Address as of 01/17/04: http://oregon.usgs.gov/pubs/WRIR02-4177/wri024177. pdf; current access available via PURL.