175th jubillee of Aleksey Tillo - a prominent Russian geographer, cartographer, land surveyor, lieutenant general of the Russian Imperial Army. https://en.wikipedia.org/wiki/Aleksey_Tillo
175th jubillee of Aleksey Tillo - a prominent Russian geographer, cartographer, land surveyor, lieutenant general of the Russian Imperial Army. https://en.wikipedia.org/wiki/Aleksey_Tillo