In my case, all of them.
As it happens, I don't use a dedicated reader. My normal ebook viewer is a PDA that does other things as well. Ebooks live on a 2GB SD card, and there are about 4,000 in an assortment of formats. The main problem is remembering which book is in which format read by which viewer.
I happen to like carrying a library in my pocket.
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Dennis
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