Dudeney, Henry Ernest, 1857-1930
Amusements in Mathematics [recurso electrónico] / Henry Ernest Dudeney - Project Gutenberg, 2005 - Project Gutenberg 16713 .
Public domain in the USA.
Text
Puzzles Mathematical recreations
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Amusements in Mathematics [recurso electrónico] / Henry Ernest Dudeney - Project Gutenberg, 2005 - Project Gutenberg 16713 .
Public domain in the USA.
Text
Puzzles Mathematical recreations
QA