கடலியல்: திருத்தங்களுக்கு இடையிலான வேறுபாடு

* [http://barcelona-ocean.com/ Barcelona-Ocean.com ]. Inspiring Education in Marine Sciences

* [https://web.archive.org/web/20180905125513/http://cfoo.co.za/seaatlas/index.php CFOO: Sea Atlas]. A source of oceanographic live data (buoy monitoring) and education for South African coasts.

* [https://www.tags-ship.com/ Memorial website for USNS Bowditch, USNS Dutton, USNS Michelson and USNS H. H. Hess]

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