Fearing persecution and punishment, printers in Britain from 1473 to 1800 didn't attach their names to many books and pamphlets, leaving the origin of many historical texts unidentified. An interdisciplinary team of literary scholars, statisticians and computer scientists from Carnegie Mellon University has attributed the Nov. 23, 1644 printing of "Areopagitica" to the London printers Matthew Simmons and Thomas Paine, with the possible involvement of Gregory Dexter.