# Library of Congress Classification/Class Z

CLASS Z - BIBLIOGRAPHY. LIBRARY SCIENCE. INFORMATION RESOURCES (GENERAL)
(Click each subclass for details)
| Subclass Z | Books (General). Writing. Paleography. Book industries and trade. Libraries. Bibliography |
| Subclass ZA | Information resources (General) |
​Subclass Z
| Z4-115.5 | Books (General). Writing. Paleography | Books (General). Writing. Paleography | Books (General). Writing. Paleography | Books (General). Writing. Paleography |
| Z4-8 | | History of books and bookmaking | History of books and bookmaking | History of books and bookmaking |
| Z40-104.5 | | Writing | Writing | Writing |
| Z41-42.5 | | | Autographs. Signatures | Autographs. Signatures |
| Z43-45 | | | Calligraphy. Penmanship | Calligraphy. Penmanship |
| Z48 | | | Duplicating processes. Copying services Including mimeographing, multilithing | Duplicating processes. Copying services Including mimeographing, multilithing |
| Z49-51.5 | | | Typewriters. Typewriting. Keyboards. Keyboarding | Typewriters. Typewriting. Keyboards. Keyboarding |
| Z52-52.5 | | | Word processing | Word processing |
| Z53-102 | | | Shorthand. Stenography. Phonography | Shorthand. Stenography. Phonography |
| Z102.5-104.5 | | | Cryptography. Ciphers. Invisible writing | Cryptography. Ciphers. Invisible writing |
| Z105-115.5 | | Manuscripts. Paleography | Manuscripts. Paleography | Manuscripts. Paleography |
| Z116-659 | Book industries and trade | Book industries and trade | Book industries and trade | Book industries and trade |
| Z116.A2 | | Treatises on the modern printed book | Treatises on the modern printed book | Treatises on the modern printed book |
| Z116.A3 | | Book design | Book design | Book design |
| Z116.A5-265.5 | | Printing | Printing | Printing |
| Z124-228 | | | History | History |
| Z231-234 | | | Printers and printing establishments | Printers and printing establishments |
| Z234 | | | | Medallic history of printing. Tokens |
| Z235-236 | | | Printer's marks, mottoes, etc. | Printer's marks, mottoes, etc. |
| Z237 | | | Paper. Watermarks, etc. | Paper. Watermarks, etc. |
| Z240-241.5 | | | Incunabula. Block books Including broadsides, playing cards | Incunabula. Block books Including broadsides, playing cards |
| Z242.9-264.5 | | | Practical printing Including printing as a business, layout, paper and ink, machinery, type and type founding, electrotyping, desktop publishing, typesetting, presswork | Practical printing Including printing as a business, layout, paper and ink, machinery, type and type founding, electrotyping, desktop publishing, typesetting, presswork |
| Z265-265.5 | | | Representation or reproduction of books, documents, etc., by photography, microphotography, or other means | Representation or reproduction of books, documents, etc., by photography, microphotography, or other means |
| Z266-276 | | Bookbinding. Book decoration | Bookbinding. Book decoration | Bookbinding. Book decoration |
| Z278-549 | | Bookselling and publishing | Bookselling and publishing | Bookselling and publishing |
| Z551-656 | | Copyright | Copyright | Copyright |
| Z657-659 | | Freedom of the press. Censorship | Freedom of the press. Censorship | Freedom of the press. Censorship |
| Z662-1000.5 | Libraries | Libraries | Libraries | Libraries |
| Z662-664 | | Collections | Collections | Collections |
| Z665-718.8 | | Library science. Information science | Library science. Information science | Library science. Information science |
| Z668-669.7 | | | Library education. Research | Library education. Research |
| Z672-Z672.13 | | | Library cooperation and coordination | Library cooperation and coordination |
| Z674.7-674.83 | | | Library information networks | Library information networks |
| Z675 | | | Classes of libraries | Classes of libraries |
| Z678-678.88 | | | Library administration and organization. Constitution | Library administration and organization. Constitution |
| Z678.89-678.892 | | | Library service agencies | Library service agencies |
| Z678.9-Z678.93 | | | Automation | Automation |
| Z679-680 | | | Library buildings. Library architecture Including planning, space utilization, security, safety, lighting, etc. | Library buildings. Library architecture Including planning, space utilization, security, safety, lighting, etc. |
| Z680.3-680.6 | | | Library communication systems | Library communication systems |
| Z681-681.3 | | | Reproduction of library materials. Storage media of library materials | Reproduction of library materials. Storage media of library materials |
| Z681.5-681.7 | | | Trustees. Library boards, committees, etc | Trustees. Library boards, committees, etc |
| Z682-682.4 | | | Personnel | Personnel |
| Z683-683.5 | | | Finance. Insurance | Finance. Insurance |
| Z684-685 | | | Supplies. Shelving. Bookstacks | Supplies. Shelving. Bookstacks |
| Z686 | | | Branches. Delivery stations. Bookmobiles | Branches. Delivery stations. Bookmobiles |
| Z687-718.85 | | | The collections. The books | The collections. The books |
| Z688 | | | | Special collections |
| Z688.5-Z688.6 | | | | Processing |
| Z689-689.8 | | | | Acquisition (selection, purchase, gifts, duplicates) |
| Z690 | | | | Exchanges |
| Z691-692 | | | | Special classes of materials Including manuscripts, maps, microforms, serials |
| Z693-695.83 | | | | Cataloging |
| Z695.85 | | | | Library handwriting |
| Z695.87 | | | | Printing of catalogs |
| Z695.9-695.94 | | | | Indexing. Abstracting |
| Z695.95 | | | | Alphabetizing. Filing |
| Z695.98 | | | | Recataloging. Reclassification |
| Z696-697 | | | | Classification and notation |
| Z698 | | | | Shelflisting. Author notation |
| Z699-699.5 | | | | Machine methods of information and retrieval. Mechanized bibliographic control |
| Z699.7 | | | | Physical processing. Shelf preparation |
| Z700 | | | | Bookbinding |
| Z700.9-701.5 | | | | Physical parameters, preservation, conservation and restoration of books and other library materials |
| Z702 | | | | Thefts and losses of books and other library materials |
| Z703.5 | | | | Stack management. Disposition of books on shelves, etc. |
| Z703.6 | | | | Discarding. Weeding |
| Z711-711.95 | | | Public services. Reference services | Public services. Reference services |
| Z712-714 | | | Circulation. Loans. Charging systems | Circulation. Loans. Charging systems |
| Z716-716.15 | | | Library extension. Library commissions. Traveling libraries | Library extension. Library commissions. Traveling libraries |
| Z716.2-718.85 | | | Libraries in relation to special topics Including libraries and community, libraries and television, children's libraries, libraries and students | Libraries in relation to special topics Including libraries and community, libraries and television, children's libraries, libraries and students |
| Z719-723 | | Libraries (General) | Libraries (General) | Libraries (General) |
| Z729-875 | | Library reports. History. Statistics | Library reports. History. Statistics | Library reports. History. Statistics |
| Z881-977 | | Library catalogs and bulletins | Library catalogs and bulletins | Library catalogs and bulletins |
| Z987-996.3 | | Book collecting Including bibliophilism, bookplates | Book collecting Including bibliophilism, bookplates | Book collecting Including bibliophilism, bookplates |
| Z997-997.2 | | Private libraries | Private libraries | Private libraries |
| Z999-1000.5 | | Booksellers' catalogs | Booksellers' catalogs | Booksellers' catalogs |
| Z1001-1121 | General bibliography | General bibliography | General bibliography | General bibliography |
| Z1001 | | Introduction to bibliography. Theory, philosophy, psychology. Bibliography. Documentation | Introduction to bibliography. Theory, philosophy, psychology. Bibliography. Documentation | Introduction to bibliography. Theory, philosophy, psychology. Bibliography. Documentation |
| Z1003-1003.5 | | Choice of books. Books and reading. Book reviews | Choice of books. Books and reading. Book reviews | Choice of books. Books and reading. Book reviews |
| Z1003.8-Z1004 | | Biography of bibliographers | Biography of bibliographers |
| Z1011-1017 | | General bibliographies | General bibliographies |
| Z1019-1033 | | Special classes of books Including prohibited books, rare books, paperbacks, reprints | Special classes of books Including prohibited books, rare books, paperbacks, reprints |
| Z1035-1035.9 | | Best books | Best books |
| Z1036 | | Booksellers' general catalogs of modern books | Booksellers' general catalogs of modern books |
| Z1037-1039 | | Books for special classes of persons, institutions, etc. | Books for special classes of persons, institutions, etc. |
| Z1041-1107 | | Anonyms and pseudonyms | Anonyms and pseudonyms |
| Z1201-4980 | National bibliography | National bibliography | National bibliography |
| Z1201-1946 | | America | America |
| Z1215-1363 | | | United States |
| Z1365-1401 | | | Canada. British North America |
| Z1411-1939 | | | Mexico. Central America. West Indies. South America |
| Z1975 | | Eastern Hemisphere | Eastern Hemisphere |
| Z2000-2959 | | Europe | Europe |
| Z3001-3496 | | Asia | Asia |
| Z3501-3975 | | Africa | Africa |
| Z4001-4980 | | Australia. Oceania | Australia. Oceania |
| Z5051-7999 | Subject bibliography Subjects arranged in alphabetical sequence | Subject bibliography Subjects arranged in alphabetical sequence | Subject bibliography Subjects arranged in alphabetical sequence |
| Z8001-8999 | Personal bibliography Names of individuals arranged in alphabetical sequence | Personal bibliography Names of individuals arranged in alphabetical sequence | Personal bibliography Names of individuals arranged in alphabetical sequence |
| ZA3038-5190 | Information resources (General) | Information resources (General) | Information resources (General) |
| ZA3150-3159 | Information services. Information centers | Information services. Information centers | Information services. Information centers |
| ZA3201-3250 | Information superhighway | Information superhighway | Information superhighway |
| ZA4050-4775 | Information in specific formats or media | Information in specific formats or media | Information in specific formats or media |
| ZA4050-4480 | | Electronic information resources | Electronic information resources |
| ZA4150-4380 | | | Computer network resources |
| ZA4450-4460 | | | Databases |
| ZA4550-4575 | | Motion pictures. Video recordings | Motion pictures. Video recordings |
| ZA4650-4675 | | Pictures. Photographs | Pictures. Photographs |
| ZA4750-4775 | | Sound recordings | Sound recordings |
| ZA5049-5190 | Government information | Government information | Government information |