It is a catalog of books (usually, though it could be something else) that is based on subject. So, if you want to look up... leatherworking, for instance, you could find all the books on that subject, rather than guessing by title or author what you are looking for.
Lesley Anne Bell has written: 'Gaining access to visual information' -- subject(s): Bibliography, Cataloging of art, Cataloging of nonbook materials, Subject cataloging
Esther Crawford has written: 'Cataloging' -- subject(s): Cataloging, Handbooks, manuals
Jennie Dorcas Fellows has written: 'Cataloging rules' -- subject(s): Cataloging
Nancy G. Thomas has written: 'Notes for serials cataloging' -- subject- s -: Anglo-American cataloguing rules, Cataloging of serial publications, Descriptive cataloging, Notes - Cataloging -, Rules, Specimens
Michael Jasenas has written: 'Cataloging small manuscript collections' -- subject(s): Cataloging of manuscripts
Theresa Hitchler has written: 'Cataloging for small libraries' -- subject(s): Cataloging, Small libraries
Melody Busse Lembke has written: 'Cataloging legal literature' -- subject(s): Anglo-American cataloguing rules, Cataloging of legal literature, Descriptive cataloging, Handbooks, manuals, Law, Library of Congress Subject headings, Rules, Subject headings, Subject headings, Library of Congress
Mary Liu Kao has written: 'Introduction to technical services for library technicians' -- subject(s): Library technicians, Technical services (Libraries), United States 'Cataloging and classification for library technicians' -- subject(s): Cataloging, Books, Classification 'Cataloging and classification for Library technicians /Mary L. Kao' -- subject(s): Cataloging, Books, Classification
Margaret Mann has written: 'Introduction to cataloging and the classification of books' -- subject(s): Books, Cataloging, Classification
Rosalind E. Miller has written: 'Commonsense cataloging' -- subject(s): Cataloging, Handbooks, manuals
Calvin J. Boyer has written: 'A descriptive cataloging sampler' -- subject(s): Anglo-American cataloging rules (North American text), Descriptive cataloging, Rules
Clyde Elaine Pettus has written: 'Cataloging standards for small public libraries' -- subject(s): Cataloging