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Bmam. Scan from Johann Christoph Brotze's book Sammlung verschiedner Lieflndischer Monumente Vorstellung des Schlograbens in Riga im Jahr aus einer Zeichnung des damaligen Ingenieur Officiers Steuben copirt der Plan University of Latvia Academic Library acadlib lv Johann Christoph Brotze PDold Johann Christoph Brotze Riga Castle