MARC manuals used by the Library of Congress.
Library of Congress.Information Systems Office.
Chicago, Information Science and Automation Division, American Library Association,
1970.
v. 1. Books: a MARC format. 4th ed. 1970.--v. 2. Data preparation manual: MARC editors. 3d ed. 1970.--v. 3. Transcription manual: MARC typists.--v. 4. Computer and magnetic tape unit usability study.
MARC formats