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    <titleInfo>
      <title>United States Telephone Area Code Boundaries, 2014</title>
    </titleInfo>
    <name type="corporate">
      <namePart>Environmental Systems Research Institute (Redlands, Calif.)</namePart>
      <role>
        <roleTerm authority="marcrelator" type="text">creator</roleTerm>
      </role>
    </name>
    <name type="corporate">
      <namePart>TomTom North America, Inc.</namePart>
      <role>
        <roleTerm authority="marcrelator" type="text">creator</roleTerm>
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    <genre valueURI="http://id.loc.gov/authorities/genreForms/gf2011026297" authority="lcgft">Geospatial data</genre>
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      <extent>57.96</extent>
      <digitalOrigin>born digital</digitalOrigin>
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    <abstract lang="eng" displayLabel="Abstract">This polygon shapefile contains the boundaries of telephone area codes in the United States. They are also known as Numbering Plan Areas (NPA). The Numbering Plan Areas reflect current and accurate boundary changes both where new NPAs split from existing NPAs and where new NPAs overlay existing NPAs. When an NPA is split, the geographic area covered by the old area code is divided geographically, with one portion retaining the previous area code and the other switching to the new area code. When a new NPA is added as an overlay, the old area code remains unaffected. Instead, all or part of the land covered by the old area code is now covered by two area codes. Data are represented at a scale of 1:250,000. This layer is part of the 2014 ESRI Data and Maps collection for ArcGIS 10.2.</abstract>
    <abstract lang="eng" displayLabel="Purpose">U.S. Telephone Area Code Boundaries provides the telephone area codes of the United States for use in telecommunications analysis.</abstract>
    <note lang="eng" displayLabel="Preferred citation">ESRI and TomTom North America, Inc. (2014). United States Telephone Area Code Boundaries, 2014. ESRI. Available at: http://purl.stanford.edu/wq040jg5974</note>
    <subject authority="lcsh" lang="eng">
      <topic>Telephone--Area codes</topic>
    </subject>
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      <geographic authority="geonames" authorityURI="http://www.geonames.org/ontology#" valueURI="http://sws.geonames.org/4566966/">Puerto Rico</geographic>
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    <subject>
      <temporal encoding="w3cdtf">2014</temporal>
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      <topic authority="ISO19115TopicCategory" authorityURI="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#MD_TopicCategoryCode" valueURI="utilitiesCommunication">Utilities and Communication</topic>
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        <scale>1:250000</scale>
        <coordinates>W 178&#xB0;13&#x2B9;40&#x2BA;--W 65&#xB0;14&#x2B9;39&#x2BA;/N 71&#xB0;23&#x2B9;26&#x2BA;--N 17&#xB0;55&#x2B9;36&#x2BA;</coordinates>
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      <dateIssued encoding="w3cdtf" keyDate="yes">2014</dateIssued>
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      <publisher>Environmental Systems Research Institute (Redlands, Calif.)</publisher>
      <edition>2014</edition>
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      <url usage="primary display">https://purl.stanford.edu/wq040jg5974</url>
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      <recordContentSource>Stanford</recordContentSource>
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      <recordIdentifier>edu.stanford.purl:wq040jg5974</recordIdentifier>
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              <gml:lowerCorner>-178.227822 17.926706</gml:lowerCorner>
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    <relatedItem type="host">
      <titleInfo>
        <title>ESRI data &amp; maps : [electronic resource]</title>
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      <location>
        <url>https://purl.stanford.edu/sv965pd3272</url>
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    <accessCondition type="useAndReproduction">These data are licensed by Stanford Libraries and are available to Stanford University affiliates only. Affiliates are limited to current faculty, staff and students. Non affiliates seeking access should contact the publisher directly. These data may not be reproduced or used for any purpose without permission.</accessCondition>
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