| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| The Philosopher's Index: Cumulative Edition, 1967-1968 | 978-0-912632-00-1 (0-912632-00-3) | 1969 |
| The Philosopher's Index: Cumulative Edition, 1969 | 978-0-912632-01-8 (0-912632-01-1) | 1970 |
| The Philosopher's Index: Cumulative Edition, 1970 | 978-0-912632-02-5 (0-912632-02-X) | 1971 |
R. H. · R. L · Richard H. · Richard H L · Richard L.