| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| history of railroads in iowa | 1.11 | 0.4 | 7505 | 5 |
| history of railroads in wisconsin | 0.12 | 0.1 | 2188 | 95 |
| history of railroads in indiana | 1.03 | 0.5 | 8374 | 70 |
| history of railroads in illinois | 1.49 | 0.9 | 4875 | 60 |
| list of railroads in iowa | 1.04 | 0.6 | 1485 | 100 |
| map of railroads in iowa | 1.26 | 0.4 | 1943 | 40 |
| historic iowa railroad map | 1.54 | 0.6 | 1229 | 97 |
| historical iowa railroad maps | 0.98 | 0.9 | 4876 | 98 |
| iowa railroad historical society | 0.43 | 0.9 | 6183 | 90 |
| railroad map of iowa | 1.64 | 0.7 | 6696 | 55 |
| railroad museums in iowa | 0.35 | 0.3 | 2844 | 23 |
| iowa railroad map 1880 | 0.77 | 0.5 | 8500 | 66 |
| indiana illinois & iowa railroad | 1.32 | 0.7 | 2115 | 28 |
| state of iowa railroad maps | 0.54 | 0.3 | 6540 | 48 |
| rock island railroad in iowa | 0.46 | 0.4 | 8674 | 38 |
| iowa northern railway company | 0.76 | 0.9 | 4852 | 97 |
| iowa interstate railroad des moines | 1.77 | 0.7 | 5440 | 96 |
| iowa northern railroad map | 0.87 | 0.3 | 1175 | 39 |
| iowa interstate railroad llc | 1.5 | 0.5 | 1501 | 75 |
| iowa chicago and eastern railroad | 1.9 | 0.9 | 461 | 40 |
| iowa interstate railroad route | 1.65 | 0.6 | 3592 | 57 |
