Na-montmorillonite  |
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| USE | montmorillonite | | SN | After 1992, use montmorillonite and sodium ion if applicable. |
Nan-king  |
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| SN | Not a valid term for GeoRef. See Nanjing China. |
nat  |
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national  |
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National Aeronautics and Space Administration  |
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| USE | NASA |
National Oceanic and Atmospheric Administration  |
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| USE | NOAA |
National Science Foundation  |
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| USE | NSF |
National Uranium Resource Evaluation Program  |
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| USE | NURE |
National Water Data Exchange  |
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| USE | NAWDEX |
National Water Information System-II  |
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| USE | NWIS-II |
National Water-Quality Assessment Program  |
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| USE | NAWQA |
native elements and alloys  |
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| SN | As of 1981, no longer a valid term for GeoRef. Use native elements or alloys as applicable. |
natural  |
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| SN | A valid index term through 1977. |
natural materials  |
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| RT | materials | | | synthetic materials | | SN | Used with minerals only to distinguish from synthetic materials. It is not used for natural materials which are rocks, sediments, isotopes, or commodities. Added to Thesaurus in 1968. |
natural selection  |
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Naubug  |
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| RT | India | | | Jammu and Kashmir | | | Pakistan | | SN | Village SE of Srinager in S Jammu and Kashmir, disputed territory between India and Pakistan. Before 1993, India was a broader term. Indexed with Jammu and Kashmir AND India and/or Pakistan as applicable. |
Navajo  |
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|