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There are specific instances where 'Back' is offered:
- after navigating a hyperlink (footnote etc)
- after using 'go to page' function
In each case the back button goes away after you turn the page (assumes you are establishing new reading postion).
Bookmarks are easy to set, but mark the start of a 'logical' page, so are not very precise. For better precision, set a highlight or note.
I haven't found lack of Back very problematic, since the other navigation tools compensate.
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