SF Citations for OED

Full record for parallel universe n.

Definition	A universe in which physical laws or historical events are different to our own
OED requirements	antedating 1923
Earliest cite	H.G Wells, Men Like Gods
Comment	Brian Ameringen submitted a cite from 1960. Ralf Brown located and Fred Galvin submitted a cite from an undated reprint of H.G. Wells "Men Like Gods"; Tim Boyer verified the cite in an American edition from January 1923, probably the first US printing Earliest cite in the OED: 1988.
Last modified	6 July, 2008

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1923 H. G. Wells Men Like Gods (1927) 55	We accept your main proposition unreservedly; namely, that we conceive ourselves to be living in a parallel universe to yours, on a planet the very brother of your own, indeed quite amazingly like yours, having regard to all the possible contrasts we might have found here.
1968 K. Laumer Assignment in Nowhere 51	From that beginning grew the Imperium—the government claiming sovereignty over the entire Net of alternate worlds. Your world—which is known to us as Blight Insular Three—is but one of the uncountable parallel universes, each differing only infinitesimally from its neighbor.
1992 L. Tuttle Lost Futures 92	You probably haven't heard of the many-worlds theory in quantum mechanics, but a lot of people consider the idea of parallel universes.
1992 P. David Imzadi iii. 25	It's something that has been considered‥that parallel universes are, in fact, alternative time tracks.
1994 Interzone Jan. 10/2	‘Don't tell me you don't get it! Look, I'm an alternate you from a parallel universe, capeche ?’
1994 Interzone June 44/2	To some extent, I think all time-travel stories are parallel-universe stories whether they are acknowledged as such or not.
2001 Sci Fi June 36/1	Imagine that there were countless parallel universes, one after the other, with no end. Imagine that in a different universe than the one you inhabit, a different you devised a plan to murder each universe's version of yourself.