| Verfasser | Häufigkeit |
|---|---|
| Gilbert, Jess Carr | 4 |
| Anderson, Gilbert | 1 |
| Bitzer, Gottfried W. | 1 |
| Blackwell, Carlyle | 1 |
| Galpin, Charles J. | 1 |
| Gilbert, Jess | 1 |
| Griffith, D. W. | 1 |
| Larson, Olaf F. | 1 |
| O'Brian, John B. | 1 |
| Robbins, Jess | 1 |
| Sawtelle, Emily Hoag | 1 |
| Stanley, George | 1 |
| Trostyanskiy, Sergey | 1 |
| Zimmerman, Julie N. | 1 |