Bill Waters says he's stumbled across the original formula for Dr Pepper in an old ledger book.
He paid 200 bucks for the book while traveling through the Texas Panhandle.
Waters says the ledger comes from the Waco, Texas, drugstore where Dr Pepper was invented.
One recipe in it is titled "D Peppers Pepsin Bitters."
The book is going up for bid later this month.
Experts at Dallas-based Heritage Auction say it could sell for up to $75,000.
Officials of Dr Pepper say the book doesn't contain the soft drink recipe, but one for a digestive aid.
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