FOREWORD 
DEEP FREEZE 61 was the seventh consecutive United States 
expedition in support of Antarctic research. Personnel of the 
U.S. Navy Hydrographic Office, supported by the National 
Science Foundation, conducted marine geophysical research 
from several icebreakers of TASK FORCE 43. Oceanographic 
studies were made in Ross, Amundsen, and Bellingshausen Seas 
and in the area of the Antarctic Convergence. Geomagnetic 
measurements were obtained along USS STATEN ISLAND track 
and Bathymetric profiles were recorded across the South 
Sandwich Trench. The analyses and tabulation of data collected 
are presented in this report. 
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