“Memoirs of Baron de Tott: Containing the State of the Turkish Empire & the Crimea, during the late war with Russia with numerous anecdotes, facts, and observations on the manners and customs of the Turks and Tartars” by François Baron de Tott (1733-1793). Download Vol.1, and/or  download Vol.2… The book was orginally published in French in four volumes (1784) which can also be reached here.. 

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