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How can I find the historical stock price for a specific stock on a specific date?
A quick search showed me that UEP merged into Ameren on Dec 31, 1997, and Ameren still exists today.  So I took a look at Ameren's Investor Relations website.   Unfortunately, they don't provide historical stock prices prior to Ameren forming, so starting with 1998.  However, I've had good luck in the past emailing a company's investor relations contact and asking for data like this that isn't on the website.  It's reasonably likely they'll have internal records they could look it up within.