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  1. 1
    by Straszewicz, S. (Stefan)
    Published 1965
    “...Pergamon Press,...”
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    Mathematical problems and puzzles from the Polish mathematical olympiads /
  2. 2
    by Steinhaus, Hugo, 1887-
    Published 1963
    “...Pergamon Press,...”
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    One hundred problems in elementary mathematics /

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