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 Euclidean and NonEuclidean Geometry by Patrick J. Ryan, June, 1986
 Mathematics and the Imagination by Edward Kasner, James Roy Newman, April, 2001
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 NonEuclidean Geometry by Roberto Bonola, H. S. Carslaw, et all December, 1954
 Shadows of the Circle: Conic Sections, Optimal Figures and NonEuclidean Geometry by Vagn Lundsgaard Hansen, November, 1998
 Taxicab Geometry: An Adventure in NonEuclidean Geometry by Eugene F. Krause, February, 1987
 Compact Manifolds With Special Holonomy (Oxford Mathematical Monographs) by Dominic D. Joyce, September, 2000
 Roads to Geometry (2nd Edition) by Edward C. Wallace, Stephen F. West, 29 August, 1997
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