| Verfasser | Häufigkeit |
| Campbell, Oscar James 1879-1970 |
19 |
| Campbell, Michael O'Neal 1965- |
11 |
| Argyll, George Douglas Campbell of 1823-1900 |
10 |
| Oman, John Campbell 1841-1911 |
10 |
| Orr, Clarissa Campbell |
10 |
| Campbell, Mary K. |
5 |
| Campbell, Olwen W. |
5 |
| Farrell, Shawn O. |
5 |
| Argyll, George Douglas Campbell Duke of |
4 |
| Campbell, Olwen Ward |
4 |
| O'Reilly for Higher Education (Firm) |
4 |
| Pedersen, Ove Kaj 1948- |
4 |
| Aberdeen and Temair, Ishbel Maria of 1857-1939 |
3 |
| Aberdeen and Temair, John Campbell Gordon of |
3 |
| Argyll, George Douglas Campbell 8th Duke of |
3 |
| Argyll, John Campbell duke of |
3 |
| Argyll, John George Edward Henry Douglas Southerland Campbell of |
3 |
| Burgon, Geoffrey |
3 |
| Campbell of Airds, Alastair Campbell |
3 |
| Campbell, Alan 1904-1963 |
3 |