| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| air force academy ufo science book | 0.57 | 0.8 | 3265 | 54 |
| us air force ufo study | 1.54 | 0.1 | 2738 | 40 |
| air force ufo report | 1.37 | 0.5 | 580 | 25 |
| air force intelligence officer ufo | 0.58 | 0.9 | 3928 | 98 |
| ufo sky pilots book | 0.73 | 0.2 | 5060 | 52 |
| air force academy book | 0.26 | 0.3 | 9716 | 20 |
| new book on ufo | 0.19 | 0.3 | 9069 | 93 |
| latest book on ufos | 0.04 | 0.1 | 5794 | 83 |
| ufo books for kids | 1.62 | 0.4 | 693 | 73 |
| ufo project blue book | 1.87 | 0.6 | 1414 | 60 |
| latest ufo books amazon | 1.71 | 0.1 | 6884 | 22 |
| ufos in art books | 1.83 | 0.1 | 8957 | 20 |
| secrets of the ufo pdf | 1.21 | 0.3 | 9287 | 93 |
| the science of ufos | 1.8 | 0.4 | 5918 | 88 |
| the best ufo books | 1.04 | 1 | 5193 | 85 |
| an introduction to ufo | 0.35 | 0.4 | 7493 | 3 |
| best recent books on ufos | 1.4 | 1 | 4639 | 27 |
| books on ufos and aliens | 1.4 | 0.4 | 3079 | 85 |
