Ludwig Ritter von Köchel since undergone revisions. Mozart's works are often referred to by their K-numbers ("cf." opus number); for example, the "Jupiter" symphony, "Symphony No. 41" K. 551. Moreover, Köchel arranged Mozart's works into twenty-four categories, which were used by Breitkopf & Härtel when they published the first complete edition of Mozart's works from 1877 to 1910, a venture partly funded by Köchel. He also catalogued the works of Johann Fux. Ludwig Ritter von Köchel Ludwig Alois Friedrich Ritter von Köchel (; 14 January 1800 – 3 June 1877) was an Austrian musicologist, writer, composer, botanist and publisher. He is best known for
Barefoot Catalogue Barefoot Catalogue The Barefoot catalogue is a series of catalogues of, mainly, revenue stamps published by stamp dealer John Barefoot of York, England, through his firm J. Barefoot Ltd. The catalogues are of an intermediate level of detail and while they are not usually the only revenue catalogue ever published for a given country, with highly specialised or historic local works sometimes existing, the low price, ready availability and up to date nature of the Barefoot range has meant that they have become the de facto standard revenue catalogue for many countries. In 2010, John Barefoot won the Research Medal