56 55 54 53 



T 



46 



45 



51 



50 49 



48 



46 



45 4 4 



43 



42 



LEGEND 

 A BERG 

 Q GROWliER 

 ^■FLIGH 



TRACK 



56 55 54 



53 



52 51 



50 49 48 47 46 45 44 



Figure 4. — Ice Conditions, 11 and 12 March 1967. 



15 



