Search SEDIS
| Data sets | Publications | Expeditions | Thesaurus |
helium  | |
|---|---|
| BT | noble gases |
| .helium | |
| NT | He-3 |
| He-4 | |
| He-4/He-3 | |
| UF | He |
| RT | He/He |
| isotopes | |
| helium gas | |
| U/He | |
| SN | Chemical element. Use helium gas for helium as a commodity. |
| helium gas | |
|---|---|
| RT | helium |
| SN | Commodity. See List C. |