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Thesaurus

nat

Natal South Africa
USE	KwaZulu-Natal South Africa

Natchitoches Parish Louisiana
BT	United States
	.Louisiana
	..Natchitoches Parish Louisiana

national

National Aeronautics and Space Administration
USE	NASA

National Coal Resources Data System
UF	NCRDS
RT	United States
	coal
	data bases
SN	Added to Thesaurus in 1985.

national monuments
BT	public lands
	.national monuments
RT	national parks
	Badlands National Park
	Craters of the Moon
	Marble Canyon
	Death Valley
	Dinosaur National Monument
	White Sands
	wilderness areas
	Glacier Bay National Park
	Katmai National Park
	Pinnacles National Monument
SN	Added to Thesaurus in 1989.

National Oceanic and Atmospheric Administration
USE	NOAA

National Petroleum Reserve Alaska
BT	United States
	.Alaska
	..Northern Alaska
	...National Petroleum Reserve Alaska
UF	National Petroleum Reserve in Alaska
	NPRA
RT	North Slope
SN	North Slope, N Alaska.

National Petroleum Reserve in Alaska
USE	National Petroleum Reserve Alaska

national policy
USE	public policy

National Science Foundation
USE	NSF

National Uranium Resource Evaluation Program
USE	NURE

National Water Data Exchange
USE	NAWDEX

National Water Information System-II
USE	NWIS-II

National Water-Quality Assessment Program
USE	NAWQA

native elements
NT	carbonado
	chaoite
	diamond
	graphite
	lonsdaleite
RT	alloys
	antimony
	antimony ores
	arsenic
	arsenic ores
	bismuth
	bismuth ores
	copper
	copper ores
	gold
	gold ores
	iron
	iron ores
	mercury
	mercury ores
	metal ores
	metals
	minerals
	nonmetal deposits
	nonmetals
	silver
	silver ores
	sulfur
	sulfur deposits
SN	Before 1981, search native elements and alloys. As of 1981, minerals that were classified under native elements and alloys are included here or under alloys.

native elements and alloys
SN	As of 1981, no longer a valid term for GeoRef. Use native elements or alloys as applicable.

natrium
USE	sodium

natroborocalcite
USE	ulexite

natural
SN	A valid index term through 1977.

natural analogs
UF	analogs, natural
	analogues, natural
RT	models
	modern analogs
	homology
	interplanetary comparison
	terrestrial comparison
	systems analogs
SN	Also search natural reactors if applicable. See comparison. Added to Thesaurus in 1995.

natural bridges
USE	natural curiosities

natural coke
USE	coke coal

natural dams
BT	dams
	.natural dams
NT	ice dams
RT	geomorphology
	geologic hazards
	mass movements
SN	Also search specific material such as debris flows, landslides, lava. Added to Thesaurus in 1995.

natural gas
BT	petroleum
	.natural gas
NT	coalbed methane
RT	hydrocarbons
	offshore
	Eastern Gas Shales Project
	energy sources
	gas hydrates
	gases
	Karachaganak Field
	clathrates
	degasification
	methane
	gas seeps
	condensates
	gas sands
	giant fields
	hydrogen sulfide
	gas storage
	gas-water interface
	gasification
	oil and gas
SN	Before 1977, also search natural AND gas. See list A for searching category codes. Commodity. See List C.

Natural History Museum of London
USE	British Museum

natural materials
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 remanence
USE	natural remanent magnetization

natural remanent magnetism
USE	natural remanent magnetization

natural remanent magnetization
BT	magnetization
	.remanent magnetization
	..natural remanent magnetization
UF	natural remanence
	natural remanent magnetism
	NRM
RT	paleomagnetism
	magnetic field
	characteristic remanent magnetization
	remagnetization

natural resources
RT	conservation
	depletion
	endangered species
	environmental geology
	geologic sites
	land cover maps
	land management
	land use
	public lands
	rain forests
	reclamation
	Resource Conservation and Recovery Act
	resources
	utilization
	wilderness areas

natural selection

Naturaliste Plateau
BT	Indian Ocean
	.Naturaliste Plateau
RT	Leg 28
	Leg 26
	DSDP Site 258
	DSDP Site 264
SN	SE Indian ocean off SW Australia. Added to Thesaurus in 1995.

naturally fractured reservoirs
RT	fractures
	fracturing
	petroleum
	petroleum engineering
	reservoir properties
	reservoir rocks
	reservoirs
SN	Sometimes difficult to determine. Also search (reservoir rocks OR subsurface reservoirs OR reservoirs OR reservoir properties) AND (petroleum OR natural gas OR geothermal energy, as applicable) AND fractures. Added to Thesaurus in 1989.

Scientific Earth Drilling Information Service - SEDIS