510
510
Lantzeff G.V. Pierce R.A. Eastward to Empire: Exploration and Conquest on the Russian Open Frontier to 1750. Montreal, 1973. P. 82-182.
510
Lantzeff G.V. Pierce R.A. Eastward to Empire: Exploration and Conquest on the Russian Open Frontier to 1750. Montreal, 1973. P. 82-182.