| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| type of sources in history | 0.64 | 1 | 5726 | 8 |
| types of written sources in history | 2 | 0.1 | 4227 | 65 |
| what is sources of history | 1.18 | 0.5 | 3330 | 80 |
| types of historical sources | 0.18 | 0.2 | 2362 | 23 |
| types of sources in history | 1.27 | 0.8 | 1802 | 15 |
| sources used in writing history | 0.45 | 0.5 | 7869 | 36 |
| only primary sources used in writing history | 0.87 | 0.5 | 7568 | 7 |
| examples of sources of history | 1.18 | 0.6 | 3853 | 24 |
| different sources of history | 1.56 | 0.9 | 8296 | 97 |
| sources of historical writing | 0.67 | 0.4 | 2335 | 57 |
| examples of written sources | 1.9 | 0.8 | 1571 | 20 |
| kinds of historical sources | 0.53 | 0.3 | 7948 | 36 |
