<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="h02070008" name="Middle Potomac-Catoctin" 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="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="q40078SWA4" name="Ashby Gap" parent="q40078SW" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="q40078SWB4" name="Bluemont" parent="q40078SW" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="q40078SWE2" name="Buckeystown" parent="q40078SW" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="q40078NWE4" name="Catoctin Furnace" parent="q40078NW" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="p1125" name="Catoctin Mountain Park" parent="p56" scope="National Capital Park"/><term thcode="1" code="p825" name="Central Intelligence Agency" parent="p68" scope="Central Intelligence Agency"/><term thcode="1" code="q40078SWB2" name="Charles Town" parent="q40078SW" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="p1324" name="Chesapeake and Ohio Canal National Historical Park" parent="p39" scope="National Historic Park"/><term thcode="1" code="f51043" name="Clarke" parent="fUS51" scope="county"/><term thcode="1" code="q40078SWG2" name="Damascus" parent="q40078SW" scope="quadrangle 1:24,000 scale"/><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="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="f24021" name="Frederick" parent="fUS24" scope="county"/><term thcode="1" code="q40078SWE1" name="Frederick" parent="q40078SW" 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="p1511" name="George Washington Memorial Parkway" parent="p45" scope="National Parkway"/><term thcode="1" code="q40078SWF3" name="Germantown" parent="q40078SW" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="q40078SWC2" name="Harpers Ferry" parent="q40078SW" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="p1327" name="Harpers Ferry National Historical Park" parent="p39" scope="National Historic Park"/><term thcode="1" code="q39078NWE1" name="Herndon" parent="q39078NW" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="f54037" name="Jefferson" parent="fUS54" scope="county"/><term thcode="1" code="q40078SWC1" name="Keedysville" parent="q40078SW" 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="q40078SWD4" name="Leesburg" parent="q40078SW" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="q40078SWC4" name="Lincoln" parent="q40078SW" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="q39080NEH1" name="Linden" parent="q39080NE" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="f51107" name="Loudoun" parent="fUS51" scope="county"/><term thcode="1" code="q39078NWB2" name="Marshall" parent="q39078NW" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="q39078NWC1" name="Middleburg" parent="q39078NW" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="q40078SWD1" name="Middletown" parent="q40078SW" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="f24031" name="Montgomery" parent="fUS24" scope="county"/><term thcode="1" code="q40078NWD4" name="Myersville" parent="q40078NW" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="p843" name="National Bureau of Standards" parent="p61" scope="General Services Administration"/><term thcode="1" code="p844" name="National Institutes of Health Animal Farm" parent="p61" scope="General Services Administration"/><term thcode="1" code="q39078NWA2" name="Orlean" parent="q39078NW" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="q40078SWD2" name="Point of Rocks" parent="q40078SW" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="q40078SWE3" name="Poolesville" parent="q40078SW" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="f51153" name="Prince William" parent="fUS51" scope="county"/><term thcode="1" code="q40078SWC3" name="Purcellville" parent="q40078SW" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="q39078NWB1" name="Rectortown" parent="q39078NW" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="q40078SWG4" name="Rockville" parent="q40078SW" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="q40078SWB3" name="Round Hill" parent="q40078SW" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="q40078SWF4" name="Seneca" parent="q40078SW" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="q40078NWD3" name="Smithsburg" parent="q40078NW" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="q40078SWE4" name="Sterling" parent="q40078SW" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="q39078NWA1" name="Upperville" parent="q39078NW" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="q40078SWF2" name="Urbana" parent="q40078SW" 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="f51187" name="Warren" parent="fUS51" scope="county"/><term thcode="1" code="f24043" name="Washington" parent="fUS24" scope="county"/><term thcode="1" code="p1107" name="Washington Dulles International Airport" parent="p66" scope="Metropolitan Washington Airports Authority"/><term thcode="1" code="q39078NWH1" name="Washington West" parent="q39078NW" scope="quadrangle 1:24,000 scale"/><term thcode="1" code="q40078SWD3" name="Waterford" parent="q40078SW" scope="quadrangle 1:24,000 scale"/></rt></descriptor>