| Keyword | CPC | PCC | Volume | Score | Length of keyword |
|---|---|---|---|---|---|
| usgs historical maps online | 0.3 | 1 | 9000 | 46 | 27 |
| usgs | 1.6 | 0.6 | 8172 | 61 | 4 |
| historical | 1.18 | 0.9 | 7220 | 79 | 10 |
| maps | 0.78 | 0.1 | 7726 | 100 | 4 |
| online | 1.85 | 1 | 2670 | 40 | 6 |
| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| usgs historical maps online | 0.03 | 0.7 | 9653 | 39 |
| usgs historical topo maps arcgis online | 0.5 | 0.2 | 3503 | 40 |
| old usgs maps online | 1.6 | 1 | 9619 | 86 |
| usgs historical map viewer | 1.55 | 0.8 | 5241 | 85 |
| usgs historical topographic maps | 0.79 | 0.9 | 4799 | 100 |
| usgs historic map viewer | 1.59 | 1 | 5087 | 97 |
| usgs historical topo maps free | 1.51 | 0.4 | 3174 | 83 |
| usgs geologic maps online | 1.52 | 0.7 | 4073 | 30 |
| usgs historical maps explorer | 1.52 | 0.8 | 6896 | 53 |
| historic usgs topo maps online | 0.41 | 0.1 | 745 | 82 |
| usgs topographical maps historical | 0.32 | 0.9 | 9167 | 27 |
| usgs historical topographic maps viewer | 0.96 | 0.5 | 9507 | 83 |
| usgs geology maps online | 1.55 | 1 | 5781 | 74 |
| usgs historic topographic maps | 0.94 | 0.5 | 191 | 1 |
| us geological survey historical maps | 1.33 | 0.2 | 9197 | 11 |
| usgs historical topographic map collection | 0.2 | 1 | 6448 | 87 |
| usgs geologic maps database | 0.47 | 0.5 | 8873 | 26 |
| usgs historic topo maps download | 1.38 | 0.6 | 6493 | 4 |
| usgs national map website | 0.54 | 0.4 | 6523 | 30 |
