Cataloging: Activities performed in the preparation of bibliographic records for CATALOGS. It is carried out according to a set of rules and contains information enabling the user to know what is available and where items can be found.Catalogs, LibraryBook Classification: A general term covering bibliographical and bibliothecal classifications. It mostly refers to library CLASSIFICATION for arrangement of books and documents on the shelves. (Harrod's Librarians' Glossary, 7th ed, p85)MicrofilmingLibrary Technical Services: Acquisition, organization, and preparation of library materials for use, including selection, weeding, cataloging, classification, and preservation.Libraries, MedicalBibliography, Descriptive: The area of bibliography which makes known precisely the material conditions of books, i.e., the full name of the author, the exact title of the work, the date and place of publication, the publisher's and printer's names, the format, the pagination, typographical particulars, illustrations, and the price, and for old books, other characteristics such as the kind of paper, binding, etc. It is also called analytical bibliography and physical bibliography. (Harrod's Librarians' Glossary, 7th ed)Filing: Collections of related records treated as a unit; ordering of such files.Punched-Card SystemsNational Library of Medicine (U.S.): An agency of the NATIONAL INSTITUTES OF HEALTH concerned with overall planning, promoting, and administering programs pertaining to advancement of medical and related sciences. Major activities of this institute include the collection, dissemination, and exchange of information important to the progress of medicine and health, research in medical informatics and support for medical library development.ComputersAudiovisual Aids: Auditory and visual instructional materials.Subject Headings: Terms or expressions which provide the major means of access by subject to the bibliographic unit.BooksAutomatic Data Processing: Data processing largely performed by automatic means.