| Keyword | CPC | PCC | Volume | Score | Length of keyword |
|---|---|---|---|---|---|
| books on nasa history | 1.83 | 0.4 | 6803 | 42 | 21 |
| books | 1.29 | 0.3 | 383 | 9 | 5 |
| on | 0.63 | 0.4 | 4283 | 63 | 2 |
| nasa | 1.67 | 0.6 | 6162 | 67 | 4 |
| history | 0.02 | 0.6 | 6091 | 76 | 7 |
| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| books on nasa history | 1.45 | 1 | 6423 | 14 |
