Ah! Life is a Paradox. Of course you could further narrow the criteria to Time Fighting - one of the coolest books I've read was by Zelazny and it had to do with the Egyptian gods & temperal fuge one-on-one combat (VERY cool).
Yes, Harry Harrison's books (some of the Stainless Steel Rat books) are very paradoxical in nature because of time travel.
(I can't believe I didn't see anyone mention H.G.Wells.)
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