WEST CHESTER, Pa. (AP) — Police in suburban Philadelphia say a thief made off with rare and valuable books from a used bookstore, including a rare edition of "To Kill A Mockingbird."

Baldwin Book's Barn manager Fred Dannaway says the thief took at least 20 rare books from a case at the front of the West Chester-area bookstore. Dannaway says the thief didn't touch money in the register and left behind other expensive books displayed on a nearby counter.

The manager says he found the signs of a break-in when he arrived for work Sunday morning. Police and store employees are working to determine all that was stolen, as Dannaway says the store doesn't have a catalog.

Officials say the total value of the stolen rare books is estimated to be up to $10,000.

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