In the absence of any other information about Erasmus Chorum on the net, I've reproduced this article which appeared in the Feb '74 issue of Beat Instrumental magazine (although from the information it contains I would guess that it was written sometime before it was published). It at least contains the basic info you need regarding the group's personel and musical direction.
ERASMUS CHORUM DISCOGRAPHY
7" SINGLES
1972 Mary Jane / Oh Lord / The Holy House (On Sunday) (Chapter 1)
1972 Jungle / ??? (Alaska)
as ERASMUS
197? I Don't Want Our Loving To Die / ??? (Alaska)