| Keyword | CPC | PCC | Volume | Score | Length of keyword |
|---|---|---|---|---|---|
| secondary sources of history | 0.57 | 0.9 | 888 | 80 | 28 |
| secondary | 0.36 | 0.5 | 4718 | 30 | 9 |
| sources | 1.99 | 0.2 | 5665 | 86 | 7 |
| of | 1.55 | 0.8 | 2520 | 70 | 2 |
| history | 0.75 | 0.8 | 1608 | 66 | 7 |
| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| secondary sources of history | 0.31 | 0.2 | 9110 | 92 |
