Map of the Don-Volga canal. Initially envisioned by the Ottomans and later by the Russians, the canal, which connects the Sea of Azov to the Caspian Sea was only completed in 1950.
A Draught of the intended Communication to be made between the Euxine and Caspian Seas.
CLARKE, Edward Daniel. Travels in various countries of Europe, Asia and Africa by Edward Daniel Clarke LL.D. Part the First. Russia Tatary and Turkey, London, Printed for T. Cadell and W. Davies, 1810.
The Gennadius Library - The American School of Classical Studies at Athens