| Sub Class |
| Z665 | Library science. Information science |
| Z668-669.7 | Library education. Research |
| Z672-Z672.13 | Library cooperation and coordination |
| Z674.7-674.83 | Library information networks |
| Z675 | Classes of libraries |
| Z678-678.88 | Library administration and organization. Constitution |
| Z678.89-678.892 | Library service agencies |
| Z678.9-Z678.93 | Automation |
| Z679-680 | Library buildings. Library architecture Including planning, space utilization, security, safety, lighting, etc. |
| Z680.3-680.6 | Library communication systems |
| Z681-681.3 | Reproduction of library materials. Storage media of library materials |
| Z681.5-681.7 | Trustees. Library boards, committees, etc. |
| Z682-682.4 | Personnel |
| Z683-683.5 | Finance. Insurance |
| Z684-685 | Supplies. Shelving. Bookstacks |
| Z686 | Branches. Delivery stations. Bookmobiles |
| Z687 | 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 |
| Z712-714 | Circulation. Loans. Charging systems |
| Z716-716.15 | 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 |
| Z719-723 | Libraries (General) |
| Z729-875 | Library reports. History. Statistics |
| Z881-977 | Library catalogs and bulletins |
| Z987-996.3 | Book collecting Including bibliophilism, bookplates |
| ZA3038-5190 | Information resources (General) |
| ZA3150-3159 | Information services. Information centers |
| ZA3201-3250 | Information superhighway |
| ZA4050-4480 | Electronic information resources |
| ZA4150-4380 | Computer network resources |
| ZA4450-4460 | Databases |
| ZA4550-4575 | Motion pictures. Video recordings |
| ZA4650-4675 | Pictures. Photographs |
| ZA4750-4775 | Sound recordings |
| ZA5049-5190 | Government information |
