CHINA - "Respectful ceremonies of the EMPEROR before the tombs of his ancestors". 1788. Etching and burin by Isidore-Stanislas HELMAN (1743-1836). Proof with the letter, on laid paper. Good margins. Plate from the series "Batailles et conquêtes de l'empereur de la Chine" commemorating the victories in Central Asia (1755-1759) of the Qianlong emperor. 40.5 x 54.2 cm. Condition A/B (trace of original median vertical fold, some light marginal foxing, good condition).