| Acronym | Meaning |
 | LAI | Leaf Area Index |
| AAR | Association Of American Railroads |
| RPDWR | Revised Primary Drinking Water Regulations |
| ATF | Advanced Toroidal Facility |
| PESIS | Photoelectron Spectroscopy Of The Inner Shell |
| DASP | Discontinuous Activated Sludge Process |
| NACSN | North American Commission On Stratigraphic Nomenclature |
| RPS | Reemitted Positron Spectroscopy |
| MCIC | Metals And Ceramics Information Center |
| PNA | Paraffins, Naphthenes, And Aromatics (in Petroleum Analysis) |
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