When State Needs Historic Stock Market Data....

Who do they go through? Well, once again, us (via Google):

Where they linked:

• S&P 500 Timeline of the Great Depression
  
• Mapping S&P 500 Performance Since 1871
  

The tools they should have used:

• The S&P 500 at Your Fingertips
  
• Investing Through the Worst
  

The first tool provides direct access to historic data and rate of return information. The latter tool provides real investment returns of a hypothetical investment made before the all time bottom of the stock market during the Great Depression using actual historic data.