26 books 2007: books 32 and 33

I've polished off two more books while on holiday. You can read what I thought of The Spy Who Came In From The Cold and True Grit over at 26 books. My next book presents a dilemma. It's a collection of short stories that were originally published in eight separate volumes. In total though they amount to just over 500 pages. Do I count them as eight books because that's how they were published or as one? Decisions, decisions.