| ▲Título▼≋ | ▲Original▼≋ | ▲Año▼≋ | Idioma | △C▼≋⊗ | ▲V▼ |
|---|---|---|---|---|---|
| To the Editor of The All-Story Cavalier, January 1913 | 1913 | Inglés |   | — | |
| To the Editor of The All-Story Weekly, February 1914 | 1914 | Inglés | | — | |
| To Willis Conover, 23 September 1936 | 1936 | Inglés | | — | |
| To Willis Conover, 24 August 1936 | 1936 | Inglés | | — | |
| A Willis Conover, 23 de septiembre de 1936 | To Willis Conover, 23 September 1936 | 2017 | Español | | — |
| A Willis Conover, 24 de agosto de 1936 | To Willis Conover, 24 August 1936 | 2017 | Español | | — |