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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