| Acronym | Meaning |
 | PPMA | Parts Per Million Atomic |
| SEIRA | Surface-enhanced Infrared Absorption |
| SWE | Snowpack Water Equivalent |
| CI-TD-HG | Configuration Interaction Time-dependent Hartree Grid |
| PORG | Photochemical Oxidants Review Group |
| RIC | Resource Conservation And Recovery Act Docket Information Center |
| LLE | Liquid Liquid Extraction |
| BMR | Basal Metabolic Rate |
| IRA | Interim Response Actions |
| RXTE | Rossi X-ray Timing Explorer |
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