National Agricultural Library subject authority file:

Code d (008/11) indicates that the formulation of the 1XX heading conforms to the National Agricultural Library subject authority file that is maintained by the National Agricultural Library.

Examples:

008/11   d

150  ##  $aCosmochemistry

008/11   d

008/10   c  [code indicating AACR 2]

008/15   a  [code indicating heading may be used as a subject added entry]

110  2#  $aFarm Credit System (U.S.)