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<http://webisa.webdatacommons.org/194326123>	<http://www.w3.org/ns/prov#value>	"Sometimes its easy to calculate e.g. internet advertising, sometimes its hard e.g. magazine advertising, seo and tweeting.ReplyDeleteRepliesRob McMillanMarch 10, 2013 at 2:27 PMThanks for signing in and contributing Bruce." .