Historical Thesaurus of the Oxford English Dictionary
With additional material from a Thesaurus of Old English 
http://www.oup.com/online/ht/Publisher:  Oxford university Press
Year Published:  2009   
Pages:  3952pp   
A historical thesuarus that presents synonyms and their meanings in chronological order, noting their appearance and disappearance, representing a map of the development of words in the English language.
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