| Acronym | Meaning |
 | RAC | Reference Air Concentration (USEPA) |
| AUDM | Advanced Unified Defect Model |
| TRIPS | Trade-Related Aspects Of Intellectual Property Rights |
| IFW | Image File Wrapper |
| UNSCEAR | United Nations Scientific Committee On The Effects Of Atomic Radiation |
| GHRH | Growth Hormone-releasing Hormone |
| RSAC | Remote Sensing Applications Center (US Forest Service) |
| AIBS | American Institute Of Biological Sciences |
| EFIN | Environmental Financing Information Network |
| GTO | Gaussian-type Orbital |
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