| ▲Título▼≋ | ▲Original▼≋ | ▲Año▽≋ | Idioma | ▲C▼≋⊗ | ▲V▼ |
|---|---|---|---|---|---|
| To Anne Tillery Renshaw, 3 October 1921 | 1921 | Inglés |   | — | |
| Letters to Rheinhart Kleiner (1915-1925) | 1915 | Inglés | | — | |
| To the Editor of The All-Story Weekly, February 1914 | 1914 | Inglés | | — | |
| To the Editor of The All-Story Cavalier, January 1913 | 1913 | Inglés | | — |