SHSBC-253 ren 282, 28 Mar 63 The GPM
SHSBC-286_PAC_1_What_Clearing_is
SHSBC-286_PAC_2_Basic_Purpose
SHSBC-263 ren 291, 14 May 63 Implant GPMs
SHSBC-311 ren 342, 26 Sep 63 Summary III: About Level IV Auditing
SHSBC-314 ren 345, 17 Oct 63 Level IV Auditing
SHSBC-318 ren 349, 29 Oct 63 Routine 4
SHSBC-323 ren 354 26 Nov 63 R4 Auditing
The SHSBC numbers below are both the original tape number and as renumbered in the clearsound version (based on Pilot's Master Tape List)
Note that most of these were at one time considered confidential although they are no longer. Also note that many level 0 and level 4 tapes are from the same time period and also discuss the 1963 GPM tech.
Note that level IV or R4 at this time consisted of running R4M2 (a successor to R3M) on actual GPMs.