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X-WR-CALDESC:24 June 1918: The 'Potomac Code' - the first of the AEF 'River
 ' series of field codes was issued.\n\nSee the link below for 'American Ar
 my Field Codes in the American Expeditionary Forces during the First World
  War.' - an NSA declassified Friedman document.
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RDATE:20301103T020000
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DESCRIPTION:24 June 1918: The 'Potomac Code' - the first of the AEF 'River'
  series of field codes was issued.\n\nSee the link below for 'American Arm
 y Field Codes in the American Expeditionary Forces during the First World 
 War.' - an NSA declassified Friedman document.
DTSTART;TZID=America/New_York:20290624T000000
DTEND;TZID=America/New_York:20290624T235900
LOCATION:
SUMMARY:1918: 'Potomac Code' was issued.
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