Robert Geretschlager
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Geometric Gems: An Appreciation For Geometric Curiosities - Volume Ii: The Wonders Of Quadrilaterals (Problem Solving in Mathematics and Beyond)
Posamentier, Alfred S; Geretschlager, Robert
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Geometric Gems: An Appreciation For Geometric Curiosities - Volume Iii: The Wonders Of Circles (Problem Solving in Mathematics and Beyond)
Posamentier, Alfred S; Geretschlager, Robert
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MATHEMATICAL NUGGETS FROM AUSTRIA: SELECTED PROBLEMS FROM THE STYRIAN MID-SECONDARY SCHOOL MATHEMATICS COMPETITIONS (Problem Solving in Mathematics and Beyond, 19)
Robert Geretschlager; Gottfried Perz
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Geometric Gems: An Appreciation For Geometric Curiosities - Volume I: The Wonders Of Triangles (Problem Solving in Mathematics and Beyond)
Geretschlager, Robert; Posamentier, Alfred S
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A Central European Olympiad: The Mathematical Duel (Problem Solving in Mathematics and Beyond)
Geretschlager Robert
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Engaging Young Student Math (V1) (Problem Solving in Mathematics and Beyond, 13)
Geretschlager Robert
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Engaging Young Student Math (V3)
Geretschlager Robert
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