| 1 | papers books and more | | | | | | | 3 | 1.12% |
| 2 | north american society for | | | | | | | 2 | 0.75% |
| 3 | technical papers books and | | | | | | | 2 | 0.75% |
| 4 | is a regional chapter | | | | | | | 2 | 0.75% |
| 5 | a regional chapter of | | | | | | | 2 | 0.75% |
| 6 | regional chapter of the | | | | | | | 2 | 0.75% |
| 7 | the north american society | | | | | | | 2 | 0.75% |
| 8 | society for trenchless technology | | | | | | | 2 | 0.75% |
| 9 | american society for trenchless | | | | | | | 1 | 0.37% |
| 10 | for the benefit of | | | | | | | 1 | 0.37% |
| 11 | benefit of the public | | | | | | | 1 | 0.37% |
| 12 | of the north american | | | | | | | 1 | 0.37% |
| 13 | chapter of the north | | | | | | | 1 | 0.37% |
| 14 | trenchless technology and that | | | | | | | 1 | 0.37% |
| 15 | technology and that is | | | | | | | 1 | 0.37% |
| 16 | and that is a | | | | | | | 1 | 0.37% |
| 17 | that is a regional | | | | | | | 1 | 0.37% |
| 18 | mastt is a regional | | | | | | | 1 | 0.37% |
| 19 | the benefit of the | | | | | | | 1 | 0.37% |
| 20 | you join the north | | | | | | | 1 | 0.37% |
| 21 | interested and concerned parties | | | | | | | 1 | 0.37% |
| 22 | of the public and | | | | | | | 1 | 0.37% |
| 23 | and field demonstrations and | | | | | | | 1 | 0.37% |
| 24 | join as a college | | | | | | | 1 | 0.37% |
| 25 | and conducting training and | | | | | | | 1 | 0.37% |
| 26 | conducting training and education | | | | | | | 1 | 0.37% |
| 27 | training and education through | | | | | | | 1 | 0.37% |
| 28 | and education through seminars | | | | | | | 1 | 0.37% |
| 29 | when you join the | | | | | | | 1 | 0.37% |
| 30 | through seminars short courses | | | | | | | 1 | 0.37% |
| 31 | field demonstrations and to | | | | | | | 1 | 0.37% |
| 32 | trenchless technology for the | | | | | | | 1 | 0.37% |
| 33 | demonstrations and to make | | | | | | | 1 | 0.37% |
| 34 | and to make available | | | | | | | 1 | 0.37% |
| 35 | to make available information | | | | | | | 1 | 0.37% |
| 36 | make available information thereof | | | | | | | 1 | 0.37% |
| 37 | available information thereof to | | | | | | | 1 | 0.37% |
| 38 | public and the natural | | | | | | | 1 | 0.37% |
| 39 | the public and the | | | | | | | 1 | 0.37% |
| 40 | technology for the benefit | | | | | | | 1 | 0.37% |