DE TCHIHATCHEFF, Pierre. Essai d'une carte générale de l'Altaï… (Paris), J. Rigo, 1845. 1000 x 855 mm. Folding map mounted on linen in 16 sections, lithographed in color. Title label pasted onto the map: "De Tchihatcheff – Voyage Scientifique dans l’Altaï Oriental – Carte". Paper slightly yellowed. The map accompanied the work published in 1845, Voyage scientifique dans l’Altaï oriental et les parties adjacentes des frontières de Chine… by Pierre de Tchihatcheff, with a report on the geological section of the work by Messrs. A. Brongniart, Dufrénoy, and Élie deBeaumont. In 1842, Tchihatcheff took part in an expedition to the Altai Mountains to study their geography and geology. He discovered the sources of the Abakan, Chu, and Chulyshman rivers, crossed the previously unexplored southern Altai, and traveled through the Sayan Mountains, while observing the tribal customs of the region's nomadic and sedentary peoples. The results of this journey were published in French in Paris in 1845 under the title Voyage scientifique dans l’Altaï oriental et les parties adjacentes de la frontière de Chine, by Pierre de Tchihatcheff. In this work, he presented the findings of his expeditions concerning the most important coal basin of the Donetsk region, the Kuznetsk Basin. Thanks to his observations, geological maps and precise surveys of the area were produced. The Chikhachyov Mountains (Monts Tchikhatchov), which he explored, were later named in his honor. Piotr Alexandrovich Tchikhatchov, or Piotr Tchihatcheff, was born on August 28 (August 16, Old Style), 1808, in Gatchina, and died on October 13, 1890, in Florence. He was a Russian geographer, geologist, and explorer who wrote in French. His name was given to the Chikhachyov Mountains in the Altai.