- Observations made by antiquarians (Those who studied sites and landscapes prior to archaeology and architectural history becoming established disciplines in the 19th century) and reported through publication or from unpublished manuscripts.
- English Heritage
- http://creativecommons.org/licenses/by/3.0 (FISH Event Types Thesaurus)
- http://www.english-heritage.org.uk (FISH Event Types Thesaurus)
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