For sale by the Superintendent of Documents, U.S. Government Printing Office, Washington, DC 20402. 



Stock number: 003-020-00171-8 



Telephone orders: 202-512-1800 



Facsimile orders: 202-512-2250 



Internet orders: https://orders.access.gpo.gov/su_docs/sale/prf/prf.html 



Mail orders: Superintendent of Documents 



PO Box 371954 '\ ' -' '■ 



Pittsburgh, PA 15250-7954 



An online version of this publication is available at http://spo.nwr.noaa.gov/olo99.htm 

 ^Ok This publication is printed on recycled paper with vegetable-based ink. 



The majority of the photographs in this publication are under the copyright protection 

 of the photographers and/or their employers. Photographs credited to an agency of 

 the U.S. Government are in the public domain. 



Cover and title page photographs: © Corel Corporation. 



U.S. Government Printing Office: 1999—792-898. 



