Etching, engraving, sulphur tint and open-bite etching and burnishing, 1749-50. 556x418 mm; 22x16½ inches, full margins. Fifth state (of 6); Robison's second edition, fourth issue through early printings of fifth edition, printed from the mid 1770s to circa 1835. From Carceri d'Invenzione. Robison 30.
