Military Art, Fortification 9, battering ram and other equipment for attacking and defending fortifications, Signed: Benard Direx, Pl. 12 et 13, p. 14, Benard (dir.), 1778, Denis Diderot; M. d'Alembert: Encyclopédie, ou dictionnaire raisonné des sciences, des arts et des métierss, des arts et des métiers. Genève: chez Pellet, MDCCLXXVIII [1778

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Military Art, Fortification 9, battering ram and other equipment for attacking and defending fortifications, Signed: Benard Direx, Pl. 12 et 13, p. 14, Benard (dir.), 1778, Denis Diderot; M. d'Alembert: Encyclopédie, ou dictionnaire raisonné des sciences, des arts et des métierss, des arts et des métiers. Genève: chez Pellet, MDCCLXXVIII [1778]

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