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On the sign:
W EHEMALIGE HOFBIBLIOTHEK FORMER COURT LIBRARY Erbaut 1723-1726 wahrscheinlich nach einem Entwurf v . Johann Bernhard Fischer v . Erlach Vollendet von Joseph Emanuel Fischer v . Erlach
Built 1723-1726 probably according to plans by Johann Berhard Fischer Erlach Completed by Joseph Emanuel Fischer v . Erlach
Sign number 48g from the "Vienna - the city introduces itself" series of signs, an initiative established in 1956 as part of the Vienna Festival, which shows significant places in the city. The serial number is displayed at the bottom of the sign. Above the sign are 4 flags of Austria, which is a hallmark of the project, and the possibility of recognizing it from a distance Click for a larger image
Note that this sign is slightly different from other signs from the same series - the text appears in it in two languages (German and English), the phrase "Vienna - A city introduces itself" does not appear at the bottom, but the initiating factor - the Vienna Tourist Board.
The sign is on the entrance from Josefsplatz Street of the National Library