REFERENCES 



1 • Radio Aids to Maritime Navigation and Hydrography, Supplementary Paper 

 No. 3 to S.P. No. 39. International Hydrographic Bureau, Monaco, 1961. 



2 . Radio Aids to Maritime Navigation and Hydrography, Supplementary Paper 



No. 4 to S.P. No. 32, 1962, International Hydrographic Bureau, Monaco, 1962. 



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