| Keyword | CPC | PCC | Volume | Score | Length of keyword |
|---|---|---|---|---|---|
| secondary sources of historical information | 1.3 | 0.3 | 2289 | 92 | 43 |
| secondary | 0.43 | 0.8 | 3849 | 52 | 9 |
| sources | 1.29 | 0.3 | 7616 | 99 | 7 |
| of | 0.97 | 1 | 5270 | 42 | 2 |
| historical | 0.95 | 0.1 | 9689 | 19 | 10 |
| information | 1.11 | 0.6 | 336 | 80 | 11 |
| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| secondary sources of historical information | 1.16 | 0.7 | 4588 | 68 |
