You can go back several decades on Yahoo! Finance or similar database (Bloomberg, for example). However, there are a couple of sticky parts that you should know about.
1) Current databases only contain current stocks. For example, you won't find data for AT&T before 1984, because the company taking over AT&T (SBC, I think) was founded in 1984. Companies that went out of business (Enron, e.g.) no longer have any data on those databases.
2) Any data before the 1950's and 1960's get really sketchy. 3) Fundamental data (like earnings, revenue, debt) doesn't go back even that far. For those projects, you can do one of two things for your research.
A) Go to the library. A major library (a university library or business school library more than a normal public library) will have the daily close data back 100 years or more. Both the Pasadena Public Library and the Los Angeles Public Library have NYSE data back to the 1890's, perhaps a bit older.
The disadvantage is that the data is not ... more.
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