UPPER INDOCTRINATION, training processes 6 to 9. The 18th ACC in Washington, July 8 to August 16, 1951, was taught in three units composed as follows: communication course, upper indoctrination course, CCH course.(HCOB 8 Jun 57)
Hubbard, L. R. (1975). Dianetics and Scientology Technical Dictionary. Los Angeles: Church of Scientology of California Publications Organization.