NATIONAL OCEANOGRAPHIC DATA CENTER 



GENERAL SERIES 



QUESTIONS ABOUT THE OCEANS 



PUBLICATION G-13 



EDWIN J. SEREMETH 



Technical Adviser For Graphics 



Library of Congress Catalog Card Number: 67-60068 



Published by the U.S. Naval Oceanographic Office 

 Washington D.C. 20390 



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

 Washington, D.C. 20402 - Price 55 cents (paper cover) 



