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[Collectif]. Relations entre les éléments d'un triangle. 

Paris, Librairie Vuibert, [v. 1900].

8vo (220x135 mm), 186-(7) pages.  binding : Contemporary quarter red chagreen. Cuts on the title page and the first leave of text to avoid an ex libris. Some handwritten notes in the margin and the blank pages. 

Third edition.

Collection of 273 formulas relating to the triangle with their demonstrations.

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