Jean-Antoine Houdon, Alexandre Brongniart, 1777, marble, National Gallery of Art, Washington. https://dartabase.art/cite/nga/1262

Jean-Antoine Houdon, Louise Brongniart, 1777, marble, National Gallery of Art, Washington. https://dartabase.art/cite/nga/1263

Jean-Antoine Houdon, Voltaire, 1778, marble, National Gallery of Art, Washington. https://dartabase.art/cite/nga/1266