| Acronym | Meaning |
 | PNA | Pacific/North American |
| ECA | Earth-crossing Asteroids |
| IRIS | Italian Research Interim Stage |
| GAO | General Accounting Office |
| FRC | Federal Records Center |
| IGB | International Geophysical Bulletin |
| RAS | Royal Astronomical Society |
| AWEA | American Wind Energy Association |
| LHS | Left-hand Side |
| OPLE | Omega Position Location Equipment |
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