The Nothing That is: A Natural History of Zero
by Robert Kaplan,Ellen Kaplan
ISBN 13: 9780140279436
Format: Paperback (256 pages) Publisher: Penguin Published: 26 Oct 2000
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The Art of the Infinite: Our Lost Language of Numbers
by Ellen Kaplan,Robert Kaplan
ISBN 13: 9780713996296
Format: Hardcover (336 pages) Publisher: Allen Lane Published: 28 Aug 2003