| Keyword | CPC | PCC | Volume | Score | Length of keyword |
|---|---|---|---|---|---|
| these are original historical sources | 0.01 | 0.3 | 3926 | 46 | 37 |
| these | 0.15 | 0.9 | 6346 | 98 | 5 |
| are | 0.56 | 0.5 | 8883 | 97 | 3 |
| original | 1.05 | 1 | 2829 | 86 | 8 |
| historical | 0.12 | 0.5 | 3213 | 99 | 10 |
| sources | 0.54 | 0.3 | 925 | 96 | 7 |
| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| these are original historical sources | 0.53 | 0.1 | 195 | 33 |
| what are the historical sources | 1.73 | 0.1 | 1061 | 38 |
| history and historical sources | 1.39 | 0.9 | 1700 | 9 |
| the sources of their history | 1.96 | 0.3 | 2322 | 41 |
| sources of historical information | 1.55 | 0.4 | 8737 | 71 |
| what are original sources | 1.46 | 0.4 | 7868 | 79 |
| major sources of history | 1.62 | 0.8 | 9950 | 37 |
| types of sources history | 0.81 | 0.2 | 3053 | 83 |
