by 
AB-Rich
ANSWERS: 2
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I would say the printers have standard sizes according to the size of paper that is used. Some paper comes 35" x 23" so to fold it up and cut off the excess to make a clean cut. The book size is determined that way.
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It goes back earlier than Shakespeare, maybe almost as far as Gutenburg. The largest pages were folded into smaller sizes, and most standard book-page sizes are simply fractions of those original folio-sized pages.
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