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Child's Conception of Geometry
Piaget, Jean & Inhelder, Barbel & Szeminska, Alina
The Externalisation of the Hierarchy
Djwhal Khul & Alice A. Bailey
Dictionary of the Khazars - Androgynous
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Handbook of Discrete and Combinatorial Mathematics, Second Edition
Kenneth H. Rosen
Stoic Six Pack 7: The Sophists
William de Witt Hyde & Plato & William Smith & Henry Sidgwick