Roskoschny, Die Wolga and ihre Zufiitsse (Leipzig, 1887, vol.
Bogusla y skiy, The Volga as a Means of Communication (Russian, 1887), with detailed profile and maps; Peretyatkovich, Volga Region in the 15th and 16th Centuries (1877); and Lender, Die Wolga (1889).
See Ibn Fadhlan, Nachrichten fiber die Wolga Bulgaren (Ger.
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