| Acronym | Meaning |
| VBCI | Valence Bond Configuration Interaction |
| APAD | 3-acetylpyridine Adenine Dinucleotidepar |
| LOGMO | Lowest Occupied Gaussian Molecular Orbital |
| NAWQA | National Water Quality Assessment (US Geological Survey) |
| IPA | Independent-particle Approximation (in Quantum Calcns. On Solids) |
| WSHS | Watershed Hydrologic System |
| IMOMO | Integrated Molecular Orbital And Molecular Orbital |
| PCO | Perturbational Crystal Orbital |
| 3SR | Self-sustained Sequence Replication |
| USDI | US Department Of Interior |