With binder format you can mail used pages back home and put them back in the binder so you still have a book. You can also just delete and add pages as needed to update the book over time.

With a regular book you tear out the needed pages for a section and have to destroy a book. For updates/new editions you have to buy a new book. YMMV <img src="/forums/images/graemlins/smile.gif" alt="" />
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Deeds can't dream what dreams can do. e.e. cummings