The Stanford Mathematics Problem Book: With Hints and Solutions (Dover Books on Mathematics) by Gyorgy Polya |
More Mathematical Morsels (Dolciani Mathematical Expositions) by Ross Honsberger |
From Erdös to Kiev: Problems of Olympiad Caliber (Dolciani Mathematical Expositions) by Ross Honsberger |
by Ross Honsberger
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by Ross Honsberger
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