If the old CPMUG is still functioning (I think it is),
get a copy of their
catalog. Most of the public domain stuff was in that data base at one time.
I bought some disks from them in 1996 so I know they were still around them.
There was a CPMUG on Compuserve also. Try that bunch for sure as they had
several folks knowledgable in CP/M 2.2 and CP/M 3.0.
The WC cdrom has the CPMUG catalogs and vols.
Allison