| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| space book pdf free download | 1.91 | 0.4 | 1341 | 12 |
| space book for kids pdf | 0.15 | 0.1 | 5157 | 63 |
| free books about space | 0.7 | 0.6 | 7502 | 86 |
| space and time book pdf download | 1.19 | 1 | 3809 | 83 |
| space book for kids | 1.03 | 0.6 | 4432 | 49 |
| online space free books | 1.7 | 0.7 | 21 | 83 |
| space books for kids free | 0.62 | 0.2 | 8765 | 90 |
| space related books pdf | 0.31 | 0.5 | 1937 | 5 |
| a book about space | 1.47 | 0.7 | 3423 | 80 |
| space science books free download | 0.91 | 0.2 | 6600 | 24 |
| free deep space books | 0.99 | 0.3 | 2976 | 8 |
| space 1999 pdf books | 0.01 | 0.4 | 8546 | 19 |
| space books to read | 1.12 | 1 | 6868 | 74 |
| space science books pdf | 1.71 | 1 | 3587 | 59 |
| the story of space book | 0.11 | 0.5 | 8173 | 18 |
| space books for children | 1.69 | 0.6 | 2997 | 56 |
| space fiction book for kids | 1.54 | 1 | 8862 | 37 |
| books about the space program | 1.87 | 0.2 | 5975 | 54 |
| kids books on space | 0.19 | 0.3 | 2076 | 57 |
