Well that is what I am trying to say - if you are saying that they can be traced back to the Steppes (!), then why limit saying that it originates from Somerset? Just because "oo ar" has entered common popular consciousness thanks to the Wurzels, it doesn't mean that the term originated with them. Surely to list the words using specific evidence in the form of the first recorded usage of that word or phrase is the best way, otherwise list the word or phrase "West country". It is an archaic publication, but you may be interested in reading (if you havn't already) "Wilkinson Sherren's The Wessex of Romance (London: Chapman & Hall, 1902)" - an extract is here: http://www.yale.edu/hardysoc/Resources/glossary.htm