- Phoenix Unit
- A floatable concrete vessel, numbers of which made up the main breakwater of the Mulberry Harbours used to secure beachheads during the allied invasion of Europe in June 1944.
- English Heritage
- http://creativecommons.org/licenses/by/3.0 (FISH Thesaurus of Monument Types)
- http://www.english-heritage.org.uk (FISH Thesaurus of Monument Types)
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