Henri Jules Giffard (Polish Wikipedia)

Analysis of information sources in references of the Wikipedia article "Henri Jules Giffard" in Polish language version.

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1web.archive.org

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web.archive.org

The Names of the 72 Scientists Listed on the Borders of Each of the Four Sides of the Eiffel Tower. toureiffel.paris. [dostęp 2011-11-20]. (ang.).