Topic and form subdivisions

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