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BMAm. Scan from Johann Christoph Brotze's book Sammlung verschiedner Lieflndischer Monumente Alte Steigebgel und Sporen die sich auf dem Hause der Schwarzen Hupter in Riga befinden University of Latvia Academic Library acadlib lv Johann Christoph Brotze PDold Johann Christoph Brotze House of Blackheads Riga