The project of the Mongolian Academy of Sciences entitled: ‘Documents concerning the 1915-16 census in Mongolia from the collection of Prof. W. Kotwicz (K III-19, j.a. 191-238) in the Archive of Science of Polish Academy of Sciences (PAN) and Polish Academy of Arts and Sciences (PAU) in Cracow’, supervised by Prof. Dr. Sampildondov Chuluun, carried out jointly with the Archive of Science of Polish Academy of Sciences (PAN) and Polish Academy of Arts and Sciences (PAU) in Cracow in collaboration with Prof. Agata Bareja-Starzyńska from the University of Warsaw. The project aims to publish facsimiles of documents drawn up by Russians in 1915-16 in Mongolia and preserved currently in three collections: in Ulaanbaatar, in Russia, and Prof. W. Kotwicz’s archival materials at the Archive of Science of Polish Academy of Sciences (PAN), and Polish Academy of Arts and Sciences (PAU) in Cracow. The diverse material, mainly in Mongolian and partly in Russian, comprises more than 3500 sheets and will be published in 8 volumes.