http://www.ncdc.noaa.gov/oa/pod-guide/ncdc/docs/klm/html/c8/s831-4.htm

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    linkage: http://www.ncdc.noaa.gov/oa/pod-guide/ncdc/docs/klm/html/c8/s831-4.htm
    protocol:  http
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    name:  NOAA KLM User's Guide, Section 8.3.1.4, GAC Data Sets (AVHRR)
    description:  Describes the characteristics and formats of AVHRR Global Area Coverage (GAC) data sets for NOAA KLM and NOAA-N satellites.
    function:  (CI_OnLineFunctionCode) information