NITRATE
| Date | Clue |
|---|---|
| 2010-05-30 | Fertilizer ingredient |
| 2006-03-04 | River pollutant |
| 1998-10-16 | Common fertilizer |
| 1998-05-07 | Saltpeter, for one |
| 1996-04-30 | Fertilizer |
| Date | Clue |
|---|---|
| 2010-05-30 | Fertilizer ingredient |
| 2006-03-04 | River pollutant |
| 1998-10-16 | Common fertilizer |
| 1998-05-07 | Saltpeter, for one |
| 1996-04-30 | Fertilizer |