41:. Each country developed its own official numbering system, some on a national and some on a port-by-port basis, and the formats have sometimes changed over time. As an internationally recognized ship identifier, national official numbers have largely been superseded by the
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Internal
Revenue Record and Customs Journal: Official Register ..., Volumes 6-7
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144:. U.S. Government Printing Office. 1903 – via Internet Archive.
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Annual List of
Merchant Vessels of the United States
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102:Merchant Shipping Act 1854
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122:"Vessel Documents"
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