| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| 1421 book | 1.21 | 0.3 | 4383 | 58 |
| 1421 book review | 0.73 | 0.8 | 5947 | 7 |
| 1421 book debunked | 0.95 | 0.8 | 1039 | 3 |
| 1421 book aiou | 1.16 | 0.9 | 9173 | 14 |
| 1421 book summary | 1.9 | 0.2 | 1079 | 3 |
| book 1421 reviews | 1 | 0.5 | 1190 | 62 |
| book 1421 gavin menzies | 1.79 | 0.3 | 8318 | 41 |
| 1421 china book | 1.1 | 0.4 | 7069 | 70 |
