| Keyword | CPC | PCC | Volume | Length string | Score |
|---|---|---|---|---|---|
| books online pdf | 1.86 | 0.1 | 1955 | 16 | 76 |
| books online pdf free | 1.25 | 0.2 | 889 | 21 | 10 |
| books online pdf free download | 0.6 | 0.4 | 1459 | 30 | 12 |
| books online pdf download | 0.21 | 0.5 | 5678 | 25 | 11 |
| read books online free pdf | 1.85 | 1 | 5638 | 26 | 43 |
| free online pdf books download sites | 1.91 | 0.6 | 5379 | 36 | 100 |
