Frontier Encounters and State Formation in Northeast Asia - Making Borders in Modern East Asia: The Tumen River Demarcation. By Nianshen Song. Cambridge: Cambridge University Press, 2019. 324 pp. ISBN: 9781316626290 (paper). - Beyond the Steppe Frontier: A History of the Sino-Russian Border. By Sören Urbansky. Princeton, N.J.: Princeton University Press, 2020. 392 pp. ISBN: 9780691181684 (cloth).
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