The CRSP Stock Database

CRSP stock databases contain the most comprehensive and accurate historical stock data available.

The CRSP Indices Database

The CRSP Stock File Indices contain historical market summary data on the NYSE, AMEX, and NASDAQ markets, individually by market, and combined with daily, monthly, quarterly and annual reporting. Each CRSP index is offered as a series that contains decile subsets for market analysis.

You can find the documentation on
http://www.crsp.chicagobooth.edu/products/documentation/crsp-us-stock-and-index-databases-data-descriptions-guide