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2. Middendorf, A.F., Issledovanie sovremennogo sostoyaniya skotovodstva v Rossii: rogatyi skot (State of the Art of Cattle Breeding in Russia: Cattle), Moscow: Tipografiya M.N. Lavrova, 1884, issue 1, pp. 226—260. https://elibrary.tambovlib.ru/?ebook=4383. Accessed December 20, 2021.
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