| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| 1976 |
|
The Last Celt: A Bio-Bibliography of Robert Ervin Howard | Donald M. Grant | Nonfiction | 377 |
| November 1977 |
|
The Last Celt: A Bio-Bibliography of Robert Ervin Howard | Berkley Windhover | Nonfiction | 377|377.4 |
| December 2009 |
|
Sentiment: An Olio of Rarer Works | The Robert E. Howard Foundation Press | Collection | 518 |
| March 2010 |
|
Sentiment: An Olio of Rarer Works | The Robert E. Howard Foundation Press | Collection | 518 |