I think a book used to be physical thing (pages bound together). You could have written books, scrap books, diaries, notebooks, pop-up books, cheque books, coupon books, even those books used for hiding stuff inside the hollowed out pages. Since the meaning has drifted to refer to the contents of what's in the book, there's confusion now. As Harry says, it's best to refer to the contents as novel, novelette, short stories,...
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