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Prague Clocktower by Koch c. . en The Prague Astronomical Clock Bohuslav Balbn Miscellanea historica regni Bohemiae Beschreibung der berhmten Uhr und Kunstwerke am Altstdter Rathhause und auf der Knigl Sternwarte zu Prag erara ch Scan by erara ch Koch date work published PDold History of the Prague Astronomical Clock Clocks in