| Verfasser | Häufigkeit |
|---|---|
| Webb, Philip Barker 1793-1854 | 39 |
| Berthelot, Sabin 1794-1880 | 26 |
| Barker, John W. 1933-2019 | 21 |
| Barker, Wayne G. | 13 |
| Barker, William | 12 |
| Barker, Lex | 10 |
| May, Karl | 9 |
| Barker, W. F. | 8 |
| Kalinke, Ernst W. | 8 |
| Reinl, Harald | 8 |
| Barker, Lex 1919-1973 | 7 |
| Barker, Roger G. 1903-1990 | 7 |
| Brice, Pierre | 7 |
| Wright, Herbert F. | 5 |
| Barker, Clare W. | 4 |
| Barker, Danny | 4 |
| Barker, Gord | 4 |
| Barker, Guy 1957- | 4 |
| Barker, James W. | 4 |
| Barker, John | 4 |