Przhevalsky, Nikolay Mikhailovich (1839-1888). Mongoliya i Strana Tangutov: Trekhletneye Puteshestvie v Vostochnoi Nagornoi Azii [Mongolia, The Tangut Country, and the Solitudes of Northern Tibet, Being a Narrative of Three Years’ Travel in Eastern High Asia, by N. Przhevalsky of the Russian Staff Corps, Member of the Imperial Russian Geographical Society/ Edition of the Russian Geographical Society. Saint Petersburg: Typ. of V.S. Balashev, 1875.