In a 21st-century version of the age of discovery, teams of computer scientists, conservationists and scholars are fanning out across the globe in a race to digitize crumbling literary treasures.

In the process, they're uncovering unexpected troves of new finds, including never-before-seen versions of the Christian Gospels, fragments of Greek poetry and commentaries on Aristotle. Improved technology is allowing researchers to scan ancient texts that were once unreadable -- blackened in fires or by chemical erosion, painted...