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Where to find historical quotes for the Dow Jones Global Total Stock Market Index?
A number of places.  First, fast and cheap, you can probably get this from EODData.com, as part of a historical index price download -- they have good customer service in my experience and will likely confirm it for you before you buy.  Any number of other providers can get it for you too.  Likely Capital IQ, Bloomberg, and other professional solutions. I checked a number of free sites, and Market Watch was the only that had a longer history than a few months.