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  1. Library of Congress rule interpretations : LCRI (1991) 0.05 
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    Issue
    Looseleaf. 2 Vols. Base text plus 1991 updates.
  2. USMARC format for authority data : including guidelines for content designation (1993) 0.04 
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    Abstract
    Includes changes to all examples throughout the publication, as approved by MARBI in January 1993. Makes obsolete the second indicator position (non-filing characters) in all of the heading fields except the 130, which is uniform titles. Also new to this edition: definition of 18X heading fields for general, geographic and chronological subdivision headings, plus related 48X and 58X fields... 7XX fields for heading-linking entries... and the control field 003, named the 'control number identifier.' Also eliminates the national-level requirement codes at the field level

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