I am teaching a graduate course on the minor prophets; almost all my students use BW 6; since we are concentrating on text criticism, most print out the BW versions of our passage in BGT, Vulg, WTT, and TAR. I generally prepare the Greek using J. Ziegler's Critical Edition of Duodecim Prophetae. To my surprise, when I discussed a passage recently in class from the LXX, the students did not know what I was talking about. Then I realized that very frequently the BW BGT varies from the critical edition represented by Ziegler. Where is BW getting its BGT text? It is not Rahlfs, which is an option, so what is the source of the BGT?