The Bach-Werke-Verzeichnis (BWV; Bach works catalogue) is a catalogue of compositions by Johann Sebastian Bach. It was first published in 1950, edited by Wolfgang Schmieder. The catalogue’s second edition appeared in 1990. An abbreviated version of that second edition, known as BWV^2a, was published in 1998.

1126 compositions were assigned a BWV number in the 20th century. More compositions were added to the catalogue in the 21st century. The Anhang (Anh.; Annex) of the BWV lists over 200 lost, doubtful and spurious compositions.

https://en.wikipedia.org/wiki/Bach-Werke-Verzeichnis