Chart of 10 by 10 geographic areas 

 (Marsdcn Squares) within which were 

 collected data received bv NOAA's 

 Environmental Data Service during the 

 period January 1 970- April 1976 

 (shaded squares) resulting from IDOE- 

 $pansor«d research. 



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U.S. GOVERNMENT PRINTING OFFICE 117b ;I0-H0I'427 1-3 



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