The section 'Web Page Hardcopy' is only visible when printed. Ignore if viewing with style sheets turrned off
Printed From: http://pubs.er.usgs.gov/usgspubs/wri/wri004225
This print version of the page is optimized to print only the content portions of the web page your were viewing and is not intended to have the same formatting as the original page.
The USGS publication you have requested is invalid. Please check the URL for typos or try the search to find your publication.