If you are talking about Sheffield Lab DtoD LPs, this is the order:
S9 - Lincoln Mayorga & Dist. Colleagues, picture of lathe on cover, commonly called vol. 1, 1971
Vol 2 - The Missing Linc, pink cover with Mr. M. sitting in a chair, 1972
Vol. 3 - four pictures on cover, 1974
I just learned that Mayorga and Sax apparently "made" or recorded a Chopin album and a Brahms album, apparently DtoD and recorded in mono in the 1959 to 1965 time period.
I looked on the current Sheffield Lab website and discogs. Anyone have more info?