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Not necessarily. I use the PDF-reader on OSX called Skim and it lets me bookmark the current page I'm on. Then I can just keep clicking the bookmark menu item and switching to the page I need. Only one copy. Each bookmark can have a label. Not too bad.

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I also use Skim, it works really well. A pretty cool feature is the back and forward buttons, that hold your page if you skip through large chunks. For example, if I use the table of contents (Cmd + Shift + T) to go to the answers section, I can press back to get back to the question I was on. Then forward brings me to the answers once again.

That's basically my textbook workflow 90% of the time.

That works too! I really like using Skim. Without it, I would definitely not like reading/doing problems from my textbooks.

Potentially even more useful is the split view. Unfortunately, it only does horizontal splits, and only two at a time. I need to search again sometime for a reader with vertical splits, as horizontal splits are mostly useless on a little 11" screen.

Though Skim is open source...

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