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If someone would care to analyze and use it, the Royal Parks page on this monument could probably be used as a reliable primary source for this article. I found it while obtaining the coordinate data. Regards, TransporterMan (TALK) 14:17, 17 July 2014 (UTC)

Thank you. It was already an external link, but yes, analysing it to get details on its designers and constructors is reliable. I've inserted that now '''tAD''' (talk) 14:24, 17 July 2014 (UTC)