There's an order of magnitude fewer libraries than that, but I get your point, and you may be right. It's an interesting "Fermi problem". I wonder how these nu

There's an order of magnitude fewer libraries than that, but I get your point, and you may be right. It's an interesting "Fermi problem". I wonder how these numbers compare to the dictionary, which is much cheaper but was also much more widely sold. BTW Microsoft Encarta clobbered the print EB a few years before the Web finished the job. EB sales fell by 50% within three years of its release! See "The Reference Wars" for a closer look at this: https://www.hbs.edu/ris/Publication%2520Files/Reference%2520Wars%2520-%2520Greenstein_6c4ac193-51eb-4758-a5a6-a4c412261411.pdf https://www.hbs.edu/ris/Publication%2520Files/Reference%2520...