June 1, 1957 by Caroline Letkeman Promo: Ability Issue 48 (June 1, 1957) Author: L. Ron Hubbard File/Ref. No.: 62-94080 View online: archive.org Better copy: archive.org The Hubbard Certified Auditor Course Personnel Efficiency Course Ad for Dianetics: The Modern Science of Mental Health Ad for Freedom Congress July 4-7, 1957