583 Subfield $b - Action identification:

Subfield $b contains a code or designation assigned to identify a specific action or to identify it in conjunction with time of action (e.g., an accession number or project code).

Examples:

583  ##  $38 record center cartons$n8$ocu. ft.$aaccession$b82-14$c19820606

583  1#  $amicrofilmed$b2004-J292$c20041103$zfor ordering information contact the Preservation Department$2pda$5ICU

583  0#  $aupgraded$c20010422$hU.S. Department of Energy$odocument$xfrom Confidential RD to Secret RD

583  0#  $aretained$bclassification$c19950713$fDeclassification Review Project$hJohn Keeton$odocument$xrequires other agency review

583  0#  $achanged$bcaveat$xSigma 1 added$xcritical nuclear weapon data information (CNWDI) added$bdistribution limitation$xInternal Distribution Only removed$c19980306$hMary Brown$odocument

[Field used for actions concerning downgrading, classifying, etc. of material.]