| Verfasser | Häufigkeit |
| Barnes, Charles Reid 1858-1910 |
2 |
| Coulter, John Merle 1851-1928 |
2 |
| Cowles, Henry Chandler 1869- |
2 |
| Cowles, John E. |
1 |
| Cowles, Julia |
1 |
| Cowles, Virginia 1910-1983 |
1 |
| Glidden, Horace K. |
1 |
| Koskull, Hans Jürgen Baron von 1913-1998 |
1 |
| Law, Hervey F. |
1 |
| Moseley, Laura Hadley |
1 |