| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| unece ghs | 0.67 | 0.8 | 8447 | 16 |
| unece ghs purple book | 1.94 | 1 | 3015 | 16 |
| unece ghs implementation | 1.41 | 0.9 | 1866 | 62 |
| un purple book ghs | 1.99 | 0.1 | 6799 | 70 |
| purple book ghs pdf | 2 | 0.5 | 8911 | 83 |
| ghs purple book latest edition | 1.02 | 0.7 | 7654 | 70 |
| ghs purple book 2023 | 1.9 | 0.4 | 6113 | 2 |
| ghs purple book rev 9 pdf | 0.56 | 0.1 | 6253 | 74 |
| ghs purple book rev 5 | 0.32 | 0.2 | 8412 | 26 |
| ghs purple book rev 9 | 0.38 | 0.9 | 838 | 55 |
| ghs purple book rev.8 | 0.1 | 0.2 | 2901 | 58 |
| ghs purple book rev 10 pdf | 1.33 | 0.9 | 9551 | 57 |
| ghs purple book 2021 | 1.74 | 0.4 | 1121 | 51 |
| ghs purple book rev 10 | 1.08 | 0.9 | 6578 | 52 |
| the purple book usace | 1.16 | 0.6 | 3578 | 71 |
| the purple book nce | 1.76 | 0.7 | 5024 | 85 |
| nce study guide purple book | 0.28 | 1 | 7337 | 68 |
| usace purple book 2024 | 1.84 | 0.2 | 5501 | 6 |
| nce prep purple book | 0.01 | 0.4 | 8021 | 88 |
| usace purple book 2023 | 0.92 | 0.4 | 6103 | 36 |
