Letters from Baron R.F. von Ungern-Sternberg, well-known general of the White forces in Russian Civil war and national liberation movement of Mongols in the beginning of the 20th Century, to Officer P.P. Malinovsky are published, translated and discussed. They contain interesting data on Pan-Mongolian plans in 1918, information on the plans of unification of Mongolian people in the Inner and Outer Mongolia, their integration with the Buryat-Mongols, as well as with the Kyrgyz (=Kazakh), Manchus and Tibetans, as well as on the plans of consolidation of the control of the Ataman G.M. Semenov’s forces in Transbaikalia.