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       IHO 23-4th:  Limits of Oceans and Seas, Special Publication 
        23, Draft 4th Edition 1986, published by the International Hydrographic 
        Bureau of the International Hydrographic Organization; note - this document has not yet been ratified and only the 3rd Edition (1953) remains in force  
      IHO 23-3rd:  Limits of Oceans and Seas, Special Publication 
        23, 3rd Edition 1953, published by the International Hydrographic Organization 
      ACIC M 49-1:  Chart of Limits of Seas and Oceans, revised 
        January 1958, published by the Aeronautical Chart and Information Center 
        (ACIC), United States Air Force; note - ACIC is now part of the National 
        Imagery and Mapping Agency (NIMA) 
      DIAM 65-18:  Geopolitical Data Elements and Related Features, 
        Data Standard No. 4, Defense Intelligence Agency Manual 65-18, December 
        1994, published by the Defense Intelligence Agency 
      The US Government has not yet adopted a standard for hydrographic codes 
        similar to the Federal Information Processing Standards (FIPS) 10-4 country 
        codes. The names and limits of the following oceans and seas are not always 
        directly comparable because of differences in the customers, needs, and 
        requirements of the individual organizations. Even the number of principal 
        water bodies varies from organization to organization. Factbook 
        users, for example, find the Atlantic Ocean and Pacific Ocean entries 
        useful, but none of the following standards include those oceans in their 
        entirety. Nor is there any provision for combining codes or overcodes 
        to aggregate water bodies. The recently delimited Southern Ocean is not 
        included. 
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