| Keyword | CPC | PCC | Volume | Score | Length of keyword |
|---|---|---|---|---|---|
| railroad history in america | 0.1 | 0.8 | 8709 | 30 | 27 |
| railroad | 0.31 | 0.1 | 123 | 20 | 8 |
| history | 0.74 | 0.8 | 902 | 84 | 7 |
| in | 1.47 | 0.8 | 459 | 1 | 2 |
| america | 1.77 | 0.1 | 2507 | 89 | 7 |
| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| railroad history in america | 1.54 | 0.4 | 3597 | 35 |
| american railroad history | 0.07 | 0.1 | 9936 | 72 |
| chinese and railroad history in america | 0.86 | 0.7 | 2992 | 50 |
| early railroad history in america | 0.07 | 1 | 6818 | 87 |
| history of railroad development in america | 0.62 | 0.8 | 1467 | 3 |
| underground railroad in nj history of america | 1.32 | 0.8 | 2009 | 10 |
| american railroad history books | 1.09 | 0.6 | 2901 | 14 |
| american railroad history timeline | 1.59 | 1 | 5100 | 33 |
| african american railroad history | 0.13 | 0.4 | 3960 | 14 |
| american history railroad documents | 1.2 | 0.2 | 3770 | 29 |
| history of american railroad companies | 0.44 | 0.3 | 7090 | 60 |
| underground railroad american history | 1.34 | 0.8 | 5668 | 52 |
| railroad history on american postage stamps | 1.39 | 0.8 | 7673 | 69 |
