| April 1, 1959 | Processes Used in 21st ACC (Concluded) | |
| April 3, 1959 | HAS Co-audit and Comm Course | |
| April 6, 1959 | Beingness and Communication | |
| April 6, 1959 | The Organization Is As Apparent... | |
| April 6, 1959 | Clear Ads | |
| April 7, 1959 | The Dynamics | |
| April 7, 1959 | Universes | |
| April 8, 1959 | A Promotion Plan | |
| April 8, 1959 | Scales | |
| April 8, 1959 | States of Being | |
| April 8, 1959 | The Hats of the Department of Promotion and Registration | |
| April 9, 1959 | Addressograph Tabbing-Libraries | |
| April 9, 1959 | Anatomy | |
| April 9, 1959 | Voluntary Help | |
| April 9, 1959 | What Can Be Done with the Mind (Reality Scale) | |
| April 14, 1959 | Mechanisms of the Mind | |
| April 14, 1959 | Overt ActMotivator Sequence | |
| April 14, 1959 | Letter from Australia | |
| April 14, 1959 | New Book | |
| April 15, 1959 | Codes | |
| April 15, 1959 | The Code of a Scientologist | |
| April 15, 1959 | Emotional Tone Scale Expanded | |
| April 16, 1959 | Axioms-Second Lecture | |
| April 16, 1959 | The Logics and Axioms of Dianetics and Scientology | |
| April 16, 1959 | Books, Cost Of | |
| April 18, 1959 | Addresses | |
| April 18, 1959 | Bookbuyers Should Be Sold... | |
| April 21, 1959 | Modern Auditing Types | |
| April 21, 1959 | Types of Auditing | |
| April 22, 1959 | Assessment | |
| April 22, 1959 | Types of Cases | |
| April 22, 1959 | Old and New Reality Scale | |
| April 23, 1959 | Present Time | |
| April 23, 1959 | Use of the E-Meter in Locating Engrams | |
| April 23, 1959 | HAS Co-audit Courses | |
| April 23, 1959 | HCO Communicator Writes from South Africa | |
| April 24, 1959 | Registrars-Materials Available To | |
| April 24, 1959 | Final HPA Exam, HCO Board of Review | |
| April 24, 1959 | Organization Posts-Two Types | |
| April 28, 1959 | Theory of Processes | |
| April 29, 1959 | Mistakes in Auditing Style | |
| April 29, 1959 | Processing of Children | |
| April 29, 1959 | Registrar-Dir of Processing, The Most Frequently Lost Line | |
| April 29, 1959 | Specialized Auditing | |
| April 29, 1959 | Defacing Books and Proper Addresses in Them | |
| April 30, 1959 | Confrontingness | |
| April 30, 1959 | Electronic Phenomena of the Mind | |
| April 30, 1959 | HAS Co-audit | |
| April 30, 1959 | Additional Staff Auditors | |
| April 30, 1959 | Long-Distance Program | |