His 1739 volume of chorale arrangements, the third part of "Clavier-Ubung", is aka "German Organ Mass"
The earliest lists of Bach's compositions are given by his 
biographers, ... four-part chorales that were published in the second half of the 
18th century), ... for instance Clavier-bung III was partly in the organ 
compositions range... [DOC] [TLE] Systematic Discussions of Bach's Other Vocal Works: Missa Brevis ... [PAR] Oct 17, 2011 ...