Formal thesaurus term relationships

BTBroader Term
NTNarrower Term

Terms in hierarchy must have an is a relationship

NT is a type of BT
NT is a part of BT
NT is an instance of BT
RTRelated Term
UFUse For (lead-in terms).
SNScope Note
Peter N. Schweitzer
U.S. Geological Survey Eastern Mineral Resources Team
USGS GIS 2008