You can call the brokerage company that services the account and they can probably look up what the original amount you contributed was.
After you enter your form 1099-R for the pension distribution in TurboTax, you should see a screen that says Did you use your IRA to pay for any of these expenses? One of the options will be Higher education. Enter the amount of the distribution there and you may qualify for a reduction in the penalty you pay for taking an early distribution from the retirement account.
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