56 



55 



54 



53 



52 



~T 



52 



51 



50 



49 



48 



47 



46 



45 



44 



FLIGHT 

 17APRI 



46 



45 



44 



V; 



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--\ 



\ 



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56 55 54 53 52 51 50 49 48 47 46 45 44 



Figure 20. — Ice Conditions, 16-19 April 1968. 



33 



