- Library of Congress homepage
- LCSH homepage subjects
- LCSH weekly lists of new subject headings, now updated monthly
- LC Classification outline available in .pdf, WordPerfect or Word
- Classification weekly lists these may be monthly now too
- LCSH Authority File find a subject heading
- WorldCat the World's libraries
- OCLC Classify copy classification
- Bibl. Formats & standards OCLC guide to MARC
- Cataloging Calculator (Cutters etc.)
- Melvil Decimal System from Library Thing
- Autocat Archives from GMane
- DDC 11 / Melvil Dui from Google Books
Internet Movie Database Broadway database All Music
Online Dictionary for LIS