EH.R: Daily S&P 500

[Samuel Williamson]

I am looking for a data set of daily closing value of the S&P 500  
series.  As I understand the series began in 1957, however, at that  
time it was an expansion of earlier series that were quoted daily  
back to at least 1928, when it was the S&P 90.

If anyone can provide me with this historical series or a source for  
me to find it, I would appreciate hearing from them.

Thank you.

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Samuel H. Williamson