This is version 2.2 of Moira (previously called SMS).

moira.tar.Z.aa	512000	split compressed tar of sources & documentation
moira.tar.Z.ab	512000	split compressed tar of sources & documentation
moira.tar.Z.ac	226215	split compressed tar of sources & documentation
tech_plan.PS.Z	119155	postscript file of the technical description (83 pp)
usenix.PS.Z	48107	postscript file of the Winter 88 Usenix paper (11 pp)

To retrieve the complete distribution, get the three moira.tar.Z.a*
files, concatenate them together, uncompress the result, then untar
it.  This complete distribution contains the other two documentation
files.