Tragic apotheosis of discord of Old Russian principalities (to the 790th anniversary of battle on the Kalka) von V. H. Berezhynskyi

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Cross-coupling tactic of siege and defensive and construction of the Old Russian defensive strengthening von V. H. Berezhynskyi, M. H. Ivanuts

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The classification of wooden and earthen linen fortification of Belhorodska abatis line von V. H. Berezhynskyi, O. M. Miroshnychenko

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