Classification Books 320 Classification, Library of Congress 126 Mental illness 53 Law 33 Subject headings 33 Cataloging 31 more ... Diagnosis 31 History 27 Indexing 15 Information organization 15 Medicine 15 Delusions 13 Schizophrenia 13 Library science 12 Folklore 10 Psychoses 10 Periodicals 9 Subject cataloging 9 Classification, Decimal 8 Information storage and retrieval systems 8 Livres 8 Music 8 Philology 8 America 7 Biology 7 Cataloging of music 7 Data processing 7 MARC formats 7 Political science 7 less ...