NPR and the Washington Post report a fascinating story of how a rare atlas was identified in an unlikely fashion: being posted to Reddit. Last month, reference librarian Anders Kvernberg stumbled across an uncatalogued atlas in the vaults of the National Library of Norway. He could make out that it was an Ottoman atlas from 1803, but not much more than that, since he couldn’t read Ottoman Turkish. He did scan and post one of its maps to Reddit, where Redditors went to work translating the text. Then, a couple of weeks later, another Redditor posted an Ottoman map of Africa, which was identified as part of the Cedid Atlas (Cedid Atlas Tercümesi), published in Istanbul in 1803. The Library of Congress has a copy, which it acquired in 1998, digitized, and put online. Kvernberg went and looked—and, he says, “started recognising the scans. Then I realized this was the very same atlas I had held in my hands a few weeks earlier.” The Cedid Atlas was rare: only 50 were printed, and only 14 were known to be held in public institutions. It turns out that the National Library of Norway has the 15th. [via]