| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| October 2008 |
|
The Collected Letters of Robert E. Howard Volume Three: 1933-1936 | The Robert E. Howard Foundation Press | Nonfiction | 467 |
| October 2021 |
|
The Collected Letters of Robert E. Howard Volume One: 1923-1929 | The Robert E. Howard Foundation Press | Nonfiction | 54|54.3 |