- An air raid shelter, designed to be placed in the garden. Made from prefabricated components, they were often semi-sunken and the structure then covered with soil for added protection.
- 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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