By Kayla EpsteinThe Washington PostOne by one, rare books vanished from the library — the journal of George Washington; a copy of Isaac Newton's "Philosophiae Naturalis Principia Mathematica" valued at nearly a million dollars; an Atlas by a 19th-century German explorer worth $1.2 million.Over a quarter of a century, these printed treasures and hundreds of others were stolen from Pittsburgh's Carnegie Library.Read more on NewsOK.com