1 folded sheet (4 unnumbered pages) : color illustrations, color maps ; 28 cm
OCLC
ocm47049512
"April 2001"--P. [1].
"U.S. Department of the Interior, U.S. Geological Survey"--P. [1].
Caption title.
Shipping list no.: 2001-0212-P.
Includes bibliographical references (page [4]).
Also available via Internet from the USGS Web site (PDF file only). Address as of 6-7-01: http://water.usgs.gov/pubs/FS/fs-031-01/pdf/fs-031-01.pdf; current access is available via PURL.