| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| poison gas world war 1 | 0.01 | 0.1 | 7384 | 9 |
| who used poison gas in world war 1 | 1.94 | 0.5 | 9102 | 18 |
| who used poison gas first in world war 1 | 0.53 | 1 | 114 | 24 |
| how was poison gas used in world war 1 | 1.95 | 0.3 | 9862 | 32 |
| poison gas used in world war 1 | 0.59 | 1 | 6716 | 76 |
| disadvantages of poison gas in world war 1 | 1.22 | 0.7 | 7452 | 7 |
| how were poison gas used in world war 1 | 1.46 | 0.2 | 1047 | 53 |
| world war 1 poison gas | 0.24 | 0.7 | 9875 | 24 |
| who introduced poison gas in ww1 | 1.2 | 0.7 | 957 | 21 |
| who made poison gas in ww1 | 0.68 | 0.3 | 5698 | 26 |
| how were poison gas used in ww1 | 1.34 | 0.4 | 1337 | 98 |
| poison gas used in wwi | 1.47 | 0.2 | 230 | 2 |
