The New York Times is uploading historic photos to the Tumblr site daily. How many are there? Dunlap writes: "We don’t know. Our best guess is five million to six million prints and contact sheets (each sheet, of course, representing many discrete images) and 300,000 sacks of negatives, ranging in format size from 35 millimeter to 5 by 7 inches — at least 10 million frames in all. The picture archive also includes 13,500 DVDs, each storing about 4.7 gigabytes worth of imagery. If we posted 10 new archival pictures every weekday on Tumblr, just from our print collection, we wouldn’t have the whole thing online until the year 3935."