DIA traded on the 4th of July, 2007?

I thought 7/4/2007 was a holiday and all US markets closed. But the historical data on Yahoo Finance showed the following trading results for DIA on 7/4/2007:

Jul 4, 2007 135.27 135.27 135.27 135.27 7,521,000 125.51

Is this right? Does this mean that all historical data of DIA would be a day off since 7/4/2007?

Is there any other source for historical stock data?

Thanks for any suggestions.
 
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