| Verfasser | Häufigkeit |
| Gifford, John 1758-1818 |
54 |
| Gifford, Clive 1966- |
50 |
| Gifford, Denis 1927-2000 |
42 |
| Gifford, George -1620 |
42 |
| Gifford, George |
41 |
| Gifford, Barry 1946- |
38 |
| Gifford, John |
30 |
| Palgrave, William Gifford 1826-1888 |
30 |
| Pinchot, Gifford |
28 |
| Gifford, Paul 1944- |
26 |
| Gifford, Terry 1946- |
22 |
| Gifford, E. Melanie |
20 |
| Gifford, Edward Winslow |
19 |
| Gifford, William 1756-1826 |
19 |
| Gifford, Henry 1913-2003 |
18 |
| Gifford, Edward W. |
16 |
| Gifford, Ernest M. |
14 |
| Cheshire, Gifford Paul 1905- |
13 |
| Gifford, Don 1919-2000 |
13 |
| Gifford, Edward Winslow 1887-1959 |
11 |