This is a selected list of sites that offer free pricing data. Many of these have deep historical data but this can be inconsistent. In addition, most free sites discontinue coverage when a company's capital structure changes. For example, Yahoo! Finance has data for United Airlines, but only for the period after they emerged from bankruptcy in 2006
Published by The National Quotation Bureau, which also published The Pink Sheets. The Pink Sheets covered over-the-counter stocks, whose prices weren't widely published prior to establishment of The Pink Sheets. No library has collected this,as it was primarily distributed to brokers.
The National Stock Summary has information compiled from the Pink Sheets. The Library holds issues from 1932 - 1965. The Chicago Public Library holds this and succeeding titles up to 2004 at the Harold Washington Library Center.
The Harold Washington Library Center also has extensive runs of the Daily Stock Price Record. It is a better place to go for people who are looking up a few historical prices that are outside of our database coverage.