Table:
text: List of operettas by Ziehrer
List
List
Title Genre Sub_divisions Libretto Première_date Place_theatre_
Ein Deutschmeister Operette 3 acts Richard Genée and Bruno Zappert 30 November 1888 Vienna, Carltheater
Wiener Luft Posse mit Gesang 3 acts Benno Rauchenegger 10 May 1889 Vienna, Theater an der Wien
Der bleiche Zauberer indianisches Lagerbild 1 act Isidor Fuchs, based on an Indian story by James Fennimore Cooper 20 September 1890 Vienna, Theater an der Wien
Der schöne Rigo Operette 2 acts Leopold Krenn and Carl Lindau 24 May 1898 Vienna, `Sommertheater Venedig in Wien`
Die Landstreicher Operette Prologue and 2 acts Leopold Krenn and Carl Lindau 26 July 1899 Vienna, `Sommertheater Venedig in Wien`
Die drei Wünsche Operette Prologue and 3 acts Leopold Krenn and Carl Lindau 9 March 1901 Vienna, Carltheater

text: List of operettas by Ziehrer
List
List
Title Genre Sub_divisions Libretto Première_date Place_theatre_
Ein tolles Mädel (English: Mlle Mischief) Vaudeville-Operette Prologue and 2 acts Wilhelm Sterk (after: Kurt Kraatz and Heinrich Stobitzer) (English: Sydney Rosenfeld) 24 August 1907, English version: 28 September 1908 Wiesbaden; English version: New York City, Lyric Theatre;
Am Lido Operette 1 act Ottokar Tann-Bergler and Alfred Deutsch-German 31 August 1907 Vienna, Kolosseum
Der Liebeswalzer Operette 3 acts Robert Bodanzky and Fritz Grünbaum 24 October 1908 Vienna, Raimund Theater
Herr und Frau Biedermeier Singspiel 1 act Wilhelm Sterk 9 January 1909 Munich, `Kleine Bühne`
Die Gaukler Operette 1 act Emil Golz and Arnold Golz 6 September 1909 Vienna, Apollotheater
Ball bei Hof Operette 3 acts Wilhelm Sterk (after the comedy Hofgunst by Thilo von Trotha) 22 January 1911 Stettin, Stadttheater

text: List of operettas by Ziehrer
List
List
Title Genre Sub_divisions Libretto Première_date Place_theatre_
Mahomed`s Paradies Burleske-Operette 1 act Composer 26 February 1866 Vienna, Harmonietheater
Das Orakel zu Delfi Burleske-Operette 2 acts Carl Costa 21 September 1872 Linz, Landestheater
Cleopatra, oder Durch drei Jahrtausende (together with: Richard Genée and Max von Weinzierl) fantastic burlesque 3 sections J. Steinher 13 November 1875 Vienna, Komische Oper
König Jérôme oder Immer lustick! Operette 4 acts Adolf Schirmer 28 November 1878 Vienna, Ringtheater
Der kleine Don Juan Operette   November 1879 Budapest, Deutsches Theater
Wiener Kinder Operette 3 acts Leopold Krenn and Carl Wolff 19 January 1881 Vienna, Carltheater

Question: How many number 1 acts were there in List of Ziehrer operettas?