The Open Guide to London: the free London guide - Differences between Version 5 and Version 4 of Earl's Court But Barons Court
Contents are identical
At least according to tube stop names, Earl's Court has an apostrophe, but Barons Court doesn't. Apparently, the latter probably had an apostrophe at one point, but it got lost:
http://www.linguistlist.org/~ask-ling/archive-most-recent/msg04651.html
And let's not even think about St James's Park ...
See also: Easily Made Mistakes.
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