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Today I discovered a very cool site that visualizes–indeed, maps–the spread of the early years of printing. I mean “maps” quite literally: this is a map with multiple layers that shows, year by year, the establishment of new printing presses. You can also show paper mills, and universities, and trade fairs. It’s a great visualization of the commercial relationships that spurred the growth of the printing industry. And it’s fun to play with, too! It’s The Atlas of Early Printing, done by folks at the University of Iowa’s Library, and it is a great resource.