Schaum's outline of geometry per Rich, Barnett 1906-, Thomas, Christopher 1973-

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Convex functions constructions, characterizations and counterexamples per Borwein, Jonathan M., Vanderwerff, Jon D.

A gateway to modern geometry the Poincare half-plane per Stahl, Saul

Geometry and the imagination. per Hilbert, David, 1862-1943

Euclidean and non-Euclidean geometries development and history per Greenberg, Marvin J. (Marvin Jay)

Euclidean and non-Euclidean geometry an analytic approach per Ryan, Patrick J.

The foundations of geometry and the non-Euclidean plane per Martin, George Edward 1932-

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Deductive systems finite and non-euclidean geometries per Lockwood, James R

Deductive systems finite and non-Euclidean geometries per Runion, Garth E.

Four-dimensional geometry an introduction per Hess, Adrien L.