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http://archaeologyinbulgaria.com/2016/04/12/bulgarias-ruse-romanias-constanta-start-project-for-interactive-visualization-of-roman-empires-lower-danube-frontier-limes-moesiae/
Bulgaria’s Ruse, Romania’s Constanta Start Project for ‘Interactive Visualization’ of Roman Empire’s Lower Danube Frontier (Limes Moesiae)