<descriptor thcode="1"><thesaurus thcode="1" name="Common geographic areas" scope="Names and identifiers of commonly-known geographic areas including oceans, continents, countries, states and provinces in North America, counties in the United States, USGS map quadrangles, and hydrologic units, nested and cross-referenced by overlap." creator="U.S. Geological Survey" rights="Public domain" edition="1.0" date="2002-03-21" codetype="alpha" prefix="geo" uri="http://www.usgs.gov/science/CommonGeographicAreas" tblname="geo" nonpref="geonp" relterm="geort" root_code="root" contact="pschweitzer"><category><term thcode="25" code="13" name="transitive" parent="12" scope="Narrower terms have an &quot;is a&quot; relationship with their broader terms, and generally can be described as part-of, type-of, or instance-of the broader term."/><term thcode="25" code="30" name="ambiguous labels" parent="26" scope="A given preferred label may be used for more than one concept in the thesaurus. A concept must be specified using its unique identifier (code). This may occur in the names of places or people."/><term thcode="25" code="4" name="place" parent="2" scope="Terms indicate extent in space, typically by reference as the names of geographic areas known from information that is stored elsewhere."/><term thcode="25" code="16" name="hierarchical" parent="11" scope="Substantive broader-narrower relationships exist among the terms."/><term thcode="25" code="13" name="transitive" parent="12" scope="Narrower terms have an &quot;is a&quot; relationship with their broader terms, and generally can be described as part-of, type-of, or instance-of the broader term."/><term thcode="25" code="30" name="ambiguous labels" parent="26" scope="A given preferred label may be used for more than one concept in the thesaurus. A concept must be specified using its unique identifier (code). This may occur in the names of places or people."/><term thcode="25" code="4" name="place" parent="2" scope="Terms indicate extent in space, typically by reference as the names of geographic areas known from information that is stored elsewhere."/><term thcode="25" code="16" name="hierarchical" parent="11" scope="Substantive broader-narrower relationships exist among the terms."/></category><altlabel><altlabel>Augmented FIPS 10-4 and FIPS 6-4</altlabel><altlabel>Augmented FIPS 10-4 and FIPS 6-4</altlabel><altlabel>CommonGeographicAreas</altlabel><altlabel>CommonGeographicAreas</altlabel></altlabel></thesaurus><term thcode="1" code="h02070010" name="Middle Potomac-Anacostia-Occoquan" parent="h020700" scope="hydrologic unit"/><bt><term thcode="1" code="h020700" name="Potomac" parent="h0207" scope="hydrologic accounting unit"/><term thcode="1" code="h0207" name="Potomac" parent="h02" scope="hydrologic subregion"/><term thcode="1" code="h02" name="Mid Atlantic" parent="hroot" scope="hydrologic region"/><term thcode="1" code="hroot" name="US hydrologic units" parent="fUS" scope="hydrologic subregion"/><term thcode="1" code="fUS" name="United States" parent="fLD10" scope="country"/><term thcode="1" code="fLD10" name="North America" parent="fLD" scope="continent"/><term thcode="1" code="fLD" name="Land" parent="root" scope="continent"/><term thcode="1" code="root" name="Earth" scope="Common geographic areas focused on the US"/></bt><rt><term thcode="1" code="f51510" name="Alexandria" parent="fUS51" scope="City"/><term thcode="1" code="q39078NWH2" name="Alexandria" parent="q39078NW" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="q39078NEA2" name="Anacostia" parent="q39078NE" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="p81" name="Andrews Air Force Base" parent="p25" scope="Air Force"/><term thcode="1" code="q39078NWG2" name="Annandale" parent="q39078NW" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="q39078NWD1" name="Arcola" parent="q39078NW" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="f51013" name="Arlington" parent="fUS51" scope="county"/><term thcode="1" code="p478" name="Arlington National Cemetery" parent="p23" scope="Army"/><term thcode="1" code="q40078SEA4" name="Beltsville" parent="q40078SE" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="p92" name="Bolling Air Force Base" parent="p25" scope="Air Force"/><term thcode="1" code="q39078NEB3" name="Brandywine" parent="q39078NE" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="q39078NWC3" name="Catlett" parent="q39078NW" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="p825" name="Central Intelligence Agency" parent="p68" scope="Central Intelligence Agency"/><term thcode="1" code="f24017" name="Charles" parent="fUS24" scope="county"/><term thcode="1" code="p1324" name="Chesapeake and Ohio Canal National Historical Park" parent="p39" scope="National Historic Park"/><term thcode="1" code="q40078SEA3" name="Clarksville" parent="q40078SE" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="p510" name="Diamond Laboratories Military Reservation (Closed)" parent="p23" scope="Army"/><term thcode="1" code="fUS11" name="District of Columbia" parent="fUS" scope="state"/><term thcode="1" code="f51059" name="Fairfax" parent="fUS51" scope="county"/><term thcode="1" code="f51600" name="Fairfax" parent="fUS51" scope="City"/><term thcode="1" code="q39078NWF2" name="Fairfax" parent="q39078NW" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="f51610" name="Falls Church" parent="fUS51" scope="City"/><term thcode="1" code="q39078NWG1" name="Falls Church" parent="q39078NW" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="f51061" name="Fauquier" parent="fUS51" scope="county"/><term thcode="1" code="p1724" name="Featherstone National Wildlife Refuge" parent="p13" scope="National Wildlife Refuge"/><term thcode="1" code="q39078NWG3" name="Fort Belvoir" parent="q39078NW" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="p517" name="Fort Belvoir Military Reservation" parent="p23" scope="Army"/><term thcode="1" code="p1126" name="Fort Washington Park" parent="p56" scope="National Capital Park"/><term thcode="1" code="q39078NWD2" name="Gainesville" parent="q39078NW" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="q40078SWG3" name="Gaithersburg" parent="q40078SW" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="p1108" name="Goddard Space Flight Center" parent="p46" scope="National Aeronautics and Space Administration"/><term thcode="1" code="p1127" name="Greenbelt Park" parent="p56" scope="National Capital Park"/><term thcode="1" code="q39078NWE1" name="Herndon" parent="q39078NW" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="q39078NWE3" name="Independent Hill" parent="q39078NW" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="q39078NWG4" name="Indian Head" parent="q39078NW" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="q39078NWE4" name="Joplin" parent="q39078NW" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="q40078SWH4" name="Kensington" parent="q40078SW" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="q39078NEB1" name="Lanham" parent="q39078NE" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="q40078SEB4" name="Laurel" parent="q40078SE" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="f51107" name="Loudoun" parent="fUS51" scope="county"/><term thcode="1" code="f51683" name="Manassas" parent="fUS51" scope="City"/><term thcode="1" code="q39078NWE2" name="Manassas" parent="q39078NW" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="p1122" name="Manassas National Battlefield Park" parent="p60" scope="National Battlefield Park"/><term thcode="1" code="f51685" name="Manassas Park" parent="fUS51" scope="City"/><term thcode="1" code="q39078NWB2" name="Marshall" parent="q39078NW" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="p1846" name="Mason Neck National Wildlife Refuge" parent="p13" scope="National Wildlife Refuge"/><term thcode="1" code="q39078NWC1" name="Middleburg" parent="q39078NW" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="q39078NWC4" name="Midland" parent="q39078NW" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="f24031" name="Montgomery" parent="fUS24" scope="county"/><term thcode="1" code="q39078NWH3" name="Mount Vernon" parent="q39078NW" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="p1367" name="National Mall" parent="p67" scope="National Mall"/><term thcode="1" code="p2136" name="Naval Research Laboratory Washington" parent="p24" scope="Navy"/><term thcode="1" code="p2138" name="Naval Station Anacostia" parent="p24" scope="Navy"/><term thcode="1" code="p2140" name="Naval Surface Warfare Center, Indian Head Division" parent="p24" scope="Navy"/><term thcode="1" code="q39078NWD3" name="Nokesville" parent="q39078NW" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="q39078NWF3" name="Occoquan" parent="q39078NW" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="p1888" name="Occoquan Bay National Wildlife Refuge" parent="p13" scope="National Wildlife Refuge"/><term thcode="1" code="p1904" name="Patuxent National Wildlife Refuge" parent="p13" scope="National Wildlife Refuge"/><term thcode="1" code="p827" name="Pentagon" parent="p63" scope="Department of Defense"/><term thcode="1" code="q39078NEA3" name="Piscataway" parent="q39078NE" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="p1128" name="Piscataway Park" parent="p56" scope="National Capital Park"/><term thcode="1" code="q39078NWH4" name="Port Tobacco" parent="q39078NW" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="f24033" name="Prince George's" parent="fUS24" scope="county"/><term thcode="1" code="f51153" name="Prince William" parent="fUS51" scope="county"/><term thcode="1" code="q39078NWF4" name="Quantico" parent="q39078NW" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="p1100" name="Quantico Marine Corps Base" parent="p40" scope="Marine Corps"/><term thcode="1" code="q39078NWB1" name="Rectortown" parent="q39078NW" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="q39078NWB4" name="Remington" parent="q39078NW" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="p1130" name="Rock Creek Park" parent="p56" scope="National Capital Park"/><term thcode="1" code="q40078SWG4" name="Rockville" parent="q40078SW" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="p1106" name="Ronald Reagan Washington National Airport" parent="p66" scope="Metropolitan Washington Airports Authority"/><term thcode="1" code="q40078SWH3" name="Sandy Spring" parent="q40078SW" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="q39078NWD4" name="Somerville" parent="q39078NW" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="q39078NWC2" name="Thoroughfare Gap" parent="q39078NW" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="p76" name="U.S. Department of Agriculture Research Center" parent="p53" scope="Agricultural Research Service"/><term thcode="1" code="p2187" name="U.S. Naval Radio Receiving Station" parent="p24" scope="Navy"/><term thcode="1" code="p2191" name="U.S. Naval Surface Weapons Center" parent="p24" scope="Navy"/><term thcode="1" code="q39078NEB2" name="Upper Marlboro" parent="q39078NE" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="q39078NWF1" name="Vienna" parent="q39078NW" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="p631" name="Vint Hill Farms Station Military Reservation (Closed)" parent="p23" scope="Army"/><term thcode="1" code="q39078NWB3" name="Warrenton" parent="q39078NW" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="p633" name="Warrenton Training Center Military Reservation" parent="p23" scope="Army"/><term thcode="1" code="p1107" name="Washington Dulles International Airport" parent="p66" scope="Metropolitan Washington Airports Authority"/><term thcode="1" code="q39078NEA1" name="Washington East" parent="q39078NE" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="q39078NWH1" name="Washington West" parent="q39078NW" scope="quadrangle 1:24,000 scale"/></rt></descriptor>