1 sheet (2 unnumbered pages) : illustrations, color maps ; 28 cm.
General Note:
Shipping list no.: 2008-0359-P. "July 2006"-- P. [1]. "U.S. Department of the Interior, U.S. Geological Survey"--P. [1].
Additional Physical Form:
Also available via Internet from the USGS web site. Address as of 8/4/08: http://erg.usgs.gov/isb/pubs/factsheets/fs20063107/fs2006-3107.p df ; current access via PURL.