| Acronym | Meaning |
 | NASA | National Aeronautics And Space Administration |
| OPA | Office Of Population Affairs |
| NHI | National Highway Institute |
| NPS | National Park Service |
| MESH | Medical Subject Headings |
| PCIE | President's Council On Integrity And Effiency |
| NINDS | National Institute Of Neurological Disorders And Stroke |
| RSPA | Research And Special Programs Administration |
| GIS | Geographic Information Systems |
| NCTR | National Center For Toxicological Research |
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