What would be interesting to me would be to find out what percentage of books published since books first began to be converted into digital format for both storage and printing have since been released commercially as ebooks. In other words, what percentage of books that could be quickly and easily converted into ebooks are actually available as such?
I suspect it might also depend on just when the majority of manuscripts were either submitted as electronic files, or when converting them into such became a normal part of the publishing industry. Maybe from the mid-Eighties on?
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