Cataloger's Reference Shelf
MARC 21 Specifications for Record Structure, Character Sets, and Exchange
Media
Standards (Record Structure)
Information Interchange Format (ANSI Z39.2)
Code for Information Interchange (ASCII) (ANSI X3.4)
Format for Information Exchange (ISO 2709)
The MARC 21 Formats: Background and Principles (http://www.loc.gov/marc/96principl.html)
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