# Topic and form subdivisions

<table data-header-hidden><thead><tr><th width="87.02702702702702">Column1.1</th><th width="663">Column1.2</th></tr></thead><tbody><tr><td><strong>.AB</strong></td><td><p>Periodicals </p><p><mark style="background-color:red;">Use for books about periodiocals</mark></p></td></tr><tr><td><strong>.AD</strong></td><td><p>Conferences, symposia </p><p><mark style="background-color:red;">USE ONLY FOR BROAD CLASSES</mark></p></td></tr><tr><td><strong>.AF</strong></td><td><p>Festschriften</p><p><mark style="background-color:red;">USE ONLY FOR BROAD CLASSES</mark></p></td></tr><tr><td><strong>.AH</strong></td><td><p>Essays, addresses, lectures (collections of)</p><p><mark style="background-color:red;">USE ONLY FOR BROAD CLASSES</mark></p></td></tr><tr><td><strong>.AI</strong></td><td>Anecdotes, facetiae, humour, satire, curiosities, etc. Fiction, poetry, drama, opera, theatre, metaphor. personal narratives (Literature in general)</td></tr><tr><td><del><strong>[.AJ</strong></del></td><td><del>Reference books. NO LONGER USED]</del></td></tr><tr><td><strong>.AK</strong></td><td>Dictionaries, glossaries</td></tr><tr><td><strong>.AL</strong></td><td>Illustrative and graphic material (incl. pictorial works, atlases, photographs, portraits, films, TV, radio, labels)</td></tr><tr><td><strong>.AM</strong></td><td><p>Philosophy, theory, general principles. </p><p>Also, nomenclature (<mark style="background-color:red;">but dictionaries of terms go in .AK</mark>)</p><p>As subdivision of a DISEASE or group of diseases: nomenclature, terminology, nosology, classification; forms, varieties, types of the disease</p></td></tr><tr><td><strong>.AN</strong></td><td>Polemical works. Controversy, criticism, errors, abuses, scandals quackery, charlatanism, fallacies, forgeries</td></tr><tr><td><strong>.AQ</strong></td><td>Organization, administrative and professional aspects Assistants, staff, personnel (<mark style="background-color:red;">BUT nurses go in .RX)</mark> Registration, status, ethics, councils, committees.</td></tr><tr><td><strong>.AR</strong></td><td>Education, training, study, teaching. Curricula, examinations; Fellowships and scholarships. Popularization</td></tr><tr><td><strong>.AS</strong></td><td>Institutions, schools, colleges, universities, laboratories, museums, etc. <mark style="background-color:red;">(For hospitals, see .RX)</mark>. Societies <mark style="background-color:red;">(but GENERAL medical societies go in CAG)</mark>.</td></tr><tr><td><strong>.AU</strong></td><td>Apparatus, instruments, appliances, utensils</td></tr><tr><td><strong>.AV</strong></td><td>Commercial publications. Price lists, trade catalogues, advertising matter (history of)</td></tr><tr><td><strong>.AW</strong></td><td><p>Research, experimental work</p><p>As subdivision of a DISEASE or group of diseases: Experimental</p></td></tr><tr><td><strong>.B</strong></td><td>Bibliography. Indexes, abstracts, reviews of the literature, library guides, documentation, etc.</td></tr><tr><td><strong>.CA</strong></td><td>Texts (i.e reprints of pre-1851 texts)</td></tr><tr><td><strong>.CZ</strong></td><td><p>Folklore, primitive ideas, superstitions, mythology, symbolism, religion</p><p><mark style="background-color:red;">Arrange concepts alphabetically, e.g. AS.CZU=unicorn</mark></p></td></tr><tr><td><strong>.D</strong></td><td>Collected biography</td></tr><tr><td><strong>.E</strong></td><td><p>As subdivision of a DISEASE or group of diseases: Epidemiology, incidence, statistics, surveys, expeditions. </p><p><mark style="background-color:red;">NB CONSIDER ALSO NLM</mark></p></td></tr><tr><td><strong>.F</strong></td><td>Biology, genetics, heredity Anthropological aspects</td></tr><tr><td><strong>.H</strong></td><td>Immunology and serology. Vaccines, preventative innoculation (subdivision of SPECIFIC DISEASE)</td></tr><tr><td><strong>.M</strong></td><td><p>As subdivision of a DISEASE or group of diseases: Complications. Accidents. Localization of the disease (subdivided by geog. table) </p><p><mark style="background-color:red;">NB CONSIDER ALSO NLM</mark></p></td></tr><tr><td><strong>.O</strong></td><td>Clinical aspects. Case studies (NB historical only)</td></tr><tr><td><strong>.P</strong></td><td>Pathological aspects</td></tr><tr><td><strong>.PX</strong></td><td>Psychological aspects, Emotional aspects</td></tr><tr><td><strong>.Q</strong></td><td>Diagnosis, Examinations, Tests, Signs and symptoms  (subdivision of SPECIFIC DISEASE)</td></tr><tr><td><strong>.R</strong></td><td>Therapeutic aspects. Treatment (NB historical only)</td></tr><tr><td><strong>.RN</strong></td><td>As subdivision of DISEASE or ORGAN / PART OF BODY: Radiotherapy, X-rays</td></tr><tr><td><strong>.RS</strong></td><td>As subdivision of DISEASE or ORGAN / PART OF BODY: Repair; reduction of fracture, hernia, etc</td></tr><tr><td><strong>.RSS</strong></td><td>As subdivision of DISEASE or ORGAN / PART OF BODY: Plastic repair (-plasty); grafting; transplantation</td></tr><tr><td><strong>.RX</strong></td><td>Hospitals and nursing</td></tr><tr><td><strong>.S</strong></td><td>Public health aspects. Prevention and control of diseases (subdivision of SPECIFIC DISEASE)</td></tr><tr><td><strong>.T</strong></td><td>Jurisprudence and legislation. Legal and insurance aspects; Political aspects</td></tr><tr><td><strong>.U</strong></td><td><p>Social, economic, financial, industrial aspects </p><p>As subdivision of an organ or part of body: Modification of the organ due to occupation</p></td></tr><tr><td><strong>.V</strong></td><td>Surgical aspects (NB historical only)</td></tr><tr><td><strong>.W</strong></td><td>Aspects relating to women, children, the aged, and race.</td></tr><tr><td><strong>.X</strong></td><td><p>Veterinary aspects (NB historical only) </p><p>As subdivision of a DISEASE or group of diseases: The disease in animals</p></td></tr></tbody></table>