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after some googling, I find the the "back" function on Sony reader. It is called "history". it's there on the menus but is not very intuitive.
I suggest that book authors wants thier books to read/flow properly on most of the epun readers out there, enough to cover 80 - 90% of market share.
not sure where to find market share analysis for epub readers though- I'd guess that nook, kobo, & sony make up a large percentage.
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