• Dewey Decimal Classification System
  with bibliographic classification decimal dewey stuff system tools
• Library of Congress Classification Outline
  
  Outline of the Library of Congress Classification (Cataloging Policy and Support Office)
  classification congress library outline
  with bibliographic classification congress library outline stuff tools by 3 users
• Library of Congress Subject Headings (University of Oregon Libraries)
  
  a guide to Library of Congress Subject Headings
  congress headings lcsh library searching subject subjects
  with bibliographic congress headings library stuff subject tools university
• MARC 21 Concise Format for Bibliographic Data
  
  This page lists the table of contents for the MARC 21 Format for Bibliographic Data (Network Development and MARC Standards Office, Library of Congress)
  marc marc21 standards
  with bibliographic concise data format marc stuff tools by 4 users
• WebDoc LCSH Interface
  with bibliographic interface lcsh stuff tools webdoc

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