| Keyword | CPC | PCC | Volume | Score | Length of keyword |
|---|---|---|---|---|---|
| usgs historical topographic maps | 0.86 | 0.8 | 3333 | 2 | 32 |
| usgs | 1.06 | 0.7 | 1950 | 9 | 4 |
| historical | 0.49 | 1 | 6778 | 98 | 10 |
| topographic | 1.31 | 0.2 | 7890 | 57 | 11 |
| maps | 0.78 | 0.5 | 4861 | 86 | 4 |
| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| usgs historical topographic maps | 1.34 | 0.1 | 125 | 14 |
