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Cataloging-related training
Fundamentals of Library of Congress Classification
Library of Congress Subject Headings
LC created this extensive subject heading training for their overseas offices and continues to update them regularly
OCLC "AskQC" Office Hours recorded sessions from OCLC's Quality Control – learn more about cataloging in OCLC and using Connexion
Each session has a featured topic (such as "when to input a new record," and "small errors with big consequences").