| Keyword | CPC | PCC | Volume | Score | Length of keyword |
|---|---|---|---|---|---|
| historical sources are materials by nature | 0.1 | 0.5 | 7211 | 63 | 42 |
| historical | 0.42 | 0.3 | 7948 | 83 | 10 |
| sources | 1.14 | 0.7 | 4699 | 54 | 7 |
| are | 0.98 | 0.7 | 835 | 34 | 3 |
| materials | 0.42 | 1 | 2095 | 25 | 9 |
| by | 0.2 | 0.6 | 9660 | 7 | 2 |
| nature | 0.68 | 0.3 | 4444 | 22 | 6 |
| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| historical sources are materials by nature | 0.95 | 0.3 | 9019 | 55 |
| what are the historical sources | 0.18 | 0.2 | 3636 | 21 |
| material sources of history | 1.1 | 1 | 2548 | 97 |
| what are the types of historical sources | 1.2 | 0.7 | 7492 | 89 |
| sources of historical facts | 0.5 | 0.9 | 5364 | 74 |
| kinds of historical sources | 0.02 | 0.3 | 4640 | 66 |
| these are original historical sources | 0.12 | 0.6 | 3768 | 77 |
| sources of historical information | 1.5 | 0.6 | 9608 | 18 |
| what are history and historical sources | 1.94 | 0.5 | 2874 | 37 |
| what are sources in history | 0.38 | 0.1 | 1459 | 78 |
| material sources of history images | 1.52 | 0.1 | 2460 | 21 |
| nature of a source history | 1.17 | 0.2 | 1339 | 8 |
| type of sources in history | 0.95 | 0.3 | 8896 | 23 |
| sources of modern history | 0.45 | 0.2 | 6289 | 100 |
