Symphony, K. 75 (Mozart) works from this time period, such as the K. 97 symphony, the autograph, which was in the possession of Breitkopf & Härtel, was destroyed during World War II. Mozart's authorship therefore remains uncertain. Most professionals consider the work authentic. The Alte Mozart-Ausgabe (published 1879–82) gives the numbering sequence 1–41 for the 41 numbered symphonies. The unnumbered symphonies (some, including K. 75, published in supplements to the Alte-Mozart Ausgabe until 1910) are sometimes given numbers in the range 42 to 56, even though they were written earlier than Mozart's Symphony No. 41 (written in 1788). The symphony K. 75 is given
Austrian National Library also successfully introduced the card index. This facilitated the continuous updating of the inventory. After the Holy Roman Empire was dissolved by Napoleon and the Austrian Empire proclaimed in its place, the library was again reorganized. Under custodian Paul Strattmann, the library received a program for the first time which described its order; the library gained a three-way viewpoint: The collection politics of the Imperial Library separated at the beginning the 19th century appreciably due to the requirements of the representation and its attention to scientific works. The multinational condition of the Austrian Empire brought with itself that, not only