| steam engine primary sources | 1.92 | 0.9 | 9067 | 28 | 97 |
| james watt steam engine primary source | 1.46 | 0.9 | 13 | 38 | 45 |
| primary source of fuel in steam engine | 0.15 | 0.4 | 1508 | 38 | 3 |
| primary source steam engine | 1.27 | 0.3 | 1660 | 27 | 81 |
| watt steam engine primary source | 0.09 | 0.2 | 295 | 32 | 75 |
| newcomen steam engine primary source | 1.61 | 0.9 | 9995 | 36 | 86 |
| source of fuel in steam engine | 1.57 | 0.7 | 8899 | 30 | 40 |
| source engine games steam | 1.7 | 0.1 | 73 | 25 | 13 |
| steam engine is powered by | 1.54 | 0.8 | 5017 | 26 | 16 |
| introduction of steam engine | 0.92 | 0.8 | 2625 | 28 | 3 |
| creation of the steam engine | 0.22 | 0.5 | 2048 | 28 | 64 |
| how was the steam engine created | 1.28 | 0.9 | 2722 | 32 | 93 |
| the steam engine was developed by | 0.37 | 0.9 | 6324 | 33 | 3 |
| development of steam engine | 1.34 | 1 | 4584 | 27 | 89 |
| about the steam engine | 1.9 | 0.5 | 7715 | 22 | 18 |
| information about the steam engine | 1.63 | 0.1 | 9838 | 34 | 44 |
| what powered the steam engine | 1.13 | 0.9 | 6515 | 29 | 21 |
| steam engine original use | 1.81 | 0.3 | 885 | 25 | 81 |
| how was steam created for steam engines | 1.93 | 1 | 3690 | 39 | 25 |
| create steam engine heat sources | 1.29 | 1 | 863 | 32 | 86 |
| where did the steam engine come from | 1.71 | 0.7 | 368 | 36 | 4 |
