| Acronym | Meaning |
 | AO | Air Overseas |
| HARVARD | Harvard/Smithsonian Center For Astrophysics |
| WVIOP | Water Vapor Intensive Observing Period |
| VAP | Voluntary Assistance Program |
| SMOW | Standard Mean Ocean Water |
| BTU | British Thermal Unit |
| VSP | Visiting Scientist Programs |
| IDB | Immediate Direct Broadcast |
| BSI | British Standards Institute |
| GSOS | GPS Surface Observing System |
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