<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="fUS24" name="Maryland" parent="fUS" scope="state"/><bt><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><nt><term thcode="1" code="f24001" name="Allegany" parent="fUS24" scope="county"/><term thcode="1" code="f24003" name="Anne Arundel" parent="fUS24" scope="county"/><term thcode="1" code="f24005" name="Baltimore" parent="fUS24" scope="county"/><term thcode="1" code="f24510" name="Baltimore" parent="fUS24" scope="county"/><term thcode="1" code="f24009" name="Calvert" parent="fUS24" scope="county"/><term thcode="1" code="f24011" name="Caroline" parent="fUS24" scope="county"/><term thcode="1" code="f24013" name="Carroll" parent="fUS24" scope="county"/><term thcode="1" code="f24015" name="Cecil" parent="fUS24" scope="county"/><term thcode="1" code="f24017" name="Charles" parent="fUS24" scope="county"/><term thcode="1" code="f24019" name="Dorchester" parent="fUS24" scope="county"/><term thcode="1" code="f24021" name="Frederick" parent="fUS24" scope="county"/><term thcode="1" code="f24023" name="Garrett" parent="fUS24" scope="county"/><term thcode="1" code="f24025" name="Harford" parent="fUS24" scope="county"/><term thcode="1" code="f24027" name="Howard" parent="fUS24" scope="county"/><term thcode="1" code="f24029" name="Kent" parent="fUS24" scope="county"/><term thcode="1" code="f24031" name="Montgomery" parent="fUS24" scope="county"/><term thcode="1" code="f24033" name="Prince George's" parent="fUS24" scope="county"/><term thcode="1" code="f24035" name="Queen Anne's" parent="fUS24" scope="county"/><term thcode="1" code="f24037" name="Saint Mary's" parent="fUS24" scope="county"/><term thcode="1" code="f24039" name="Somerset" parent="fUS24" scope="county"/><term thcode="1" code="f24041" name="Talbot" parent="fUS24" scope="county"/><term thcode="1" code="f24043" name="Washington" parent="fUS24" scope="county"/><term thcode="1" code="f24045" name="Wicomico" parent="fUS24" scope="county"/><term thcode="1" code="f24047" name="Worcester" parent="fUS24" scope="county"/></nt><rt><term thcode="1" code="q40078" name="Baltimore" parent="qroot" scope="quadrangle 1:250,000 scale"/><term thcode="1" code="q40080" name="Cumberland" parent="qroot" scope="quadrangle 1:250,000 scale"/><term thcode="1" code="h0204" name="Delaware" parent="h02" scope="hydrologic subregion"/><term thcode="1" code="a308" name="Early Mesozoic basin aquifers" parent="aroot" scope="aquifer"/><term thcode="1" code="q38076" name="Eastville" parent="qroot" scope="quadrangle 1:250,000 scale"/><term thcode="1" code="a503" name="Mississippian aquifers" parent="aroot" scope="aquifer"/><term thcode="1" code="h0502" name="Monongahela" parent="h05" scope="hydrologic subregion"/><term thcode="1" code="a205" name="Northern Atlantic Coastal Plain aquifer system" parent="aroot" scope="aquifer"/><term thcode="1" code="a310" name="Pennsylvanian aquifers" parent="aroot" scope="aquifer"/><term thcode="1" code="a417" name="Piedmont and Blue Ridge carbonate-rock aquifers" parent="aroot" scope="aquifer"/><term thcode="1" code="a611" name="Piedmont and Blue Ridge crystalline-rock aquifers" parent="aroot" scope="aquifer"/><term thcode="1" code="h0207" name="Potomac" parent="h02" scope="hydrologic subregion"/><term thcode="1" code="q38078" name="Richmond" parent="qroot" scope="quadrangle 1:250,000 scale"/><term thcode="1" code="q39076" name="Salisbury" parent="qroot" scope="quadrangle 1:250,000 scale"/><term thcode="1" code="h0205" name="Susquehanna" parent="h02" scope="hydrologic subregion"/><term thcode="1" code="h0206" name="Upper Chesapeake" parent="h02" scope="hydrologic subregion"/><term thcode="1" code="a502" name="Valley and Ridge aquifers" parent="aroot" scope="aquifer"/><term thcode="1" code="a505" name="Valley and Ridge carbonate-rock aquifers" parent="aroot" scope="aquifer"/><term thcode="1" code="q39078" name="Washington" parent="qroot" scope="quadrangle 1:250,000 scale"/><term thcode="1" code="q40076" name="Wilmington" parent="qroot" scope="quadrangle 1:250,000 scale"/></rt></descriptor>