| Verfasser | Häufigkeit |
| Nichols, Robert |
12 |
| Nichols, Robert 1979- |
7 |
| Arnold, Robert R. |
6 |
| Hill, Harold C. |
6 |
| McChesney, Robert Waterman 1952- |
6 |
| Nichols, Aylmer V. |
6 |
| Nichols, John |
6 |
| Nichols, Robert E. 1932- |
4 |
| Kulik, Robert Nichols |
3 |
| Nichols, Ernest L. |
3 |
| Bancroft, Anne |
2 |
| Handfield, Robert B. |
2 |
| Heath, Robert |
2 |
| Hoffman, Dustin |
2 |
| Loehlin, John C. |
2 |
| Murphy, Robert Cushman |
2 |
| Nichols, A. |
2 |
| Nichols, John Gough 1806-1873 |
2 |
| Nichols, John Treadwell 1940- |
2 |
| Nichols, Mike |
2 |