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Mathematical essays and recreations (1903)
Schubert, Hermann, 1848-1911 · Chicago : Open Court Pub. Co. ; London : Kegan Paul, Trench, Truebner · leaf 55
ALBERT DURER'S ENGRAVING MELANCHOLY Genius of the Industrial Science of Mechanics.Mathematics · Magic squares · Hyperspace · Circle-squaring · Mathematics -- Philosophy
Internet Archive · Cornell University Library · Public domain (published before 1931). Free to use for anything.
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