| Doctor Thaddeus C. Harker
by Edwin Truett |
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| Story Title | Publication | Publisher | Format | Date | Publication | Date | Notes |
| Crime Nest | Behind the Mask #9 | Fading Shadows Inc. | M | SUM91 | Detective Dime Novels | 04/40 | 219 |
| Woe to the Vanquished | Behind the Mask #10 | Fading Shadows Inc. | M | FALL91 | Red Star Detective | 06/40 | |
| South of the Border | Behind the Mask #26 | Fading Shadows Inc. | M | 05/94 | Red Star Detective | 08/40 | |