NLM Classification Schedule WN

QS QT QU QV QW QX QY QZ W WA WB WC WD WE WF WG WH WI WJ WK WL WM WN WO WP WQ WR WS WT WU WV WW WX WY WZ

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WN Radiology. Diagnostic imaging
	Classify material on ionizing radiation used in the diagnosis and treatment of a specific disease, organ or system with the disease, organ or system. General diagnostic uses of ultrasound and magnetic resonance imaging are included here. Classify material on non-ionizing radiation in WB or other applicable numbers (See Index to this Classification).
	WN 1-160 Reference Works. Diagnostic Technology
	WN 180-240 Diagnostic Imaging. Radiography
	WN 250-250.6 Radiotherapy
	WN 300-340 Radium
	WN 415-665 Radioactivity (Excluding Roentgen Rays and Radium)
	WN 415-420 General Radioactivity
	WN 440-450 Nuclear Medicine
	WN 600-650 Radiation Effects. Radiation Protection
	WN 660-665 Radiometry
	Reference Works. Diagnostic Technology

WN 1	Societies (Cutter from name of society) (Used for both monographs and serials)
	Includes ephemeral membership lists issued serially or separately. Classify annual reports, journals, etc., in W1.
	Collected works (General)
WN 5	By several authors
WN 7	By individual authors

WN 9	Addresses. Essays. Lectures (General)

WN 11	History (Table G)
WN 11.1	General coverage (Not Table G)

WN 13	Dictionaries. Encyclopedias (Used for both monographs and serials)

WN 15	Classification. Terminology (Used for both monographs and serials)

WN 16	Tables. Statistics (Used for both monographs and serials)

WN 17	Atlases. Pictorial works
	Classify atlases limited to a particular radiological subject here also.

WN 18	Education
	Classify here works about education.

WN 18.2	Educational materials (Used for both monographs and serials)
	Classify here educational materials, e.g., outlines, questions and answers, programmed instruction, catalogs, computer-assisted instruction, etc., regardless of format. Classify textbooks, regardless of format, by subject.

WN 19	Schools and colleges (Used for both monographs and serials)
	Classify courses of study, catalogs, etc., in W 19.5.

WN 20	Research (General)
	Classify here works about research in general. Classify works about research on a particular subject by subject.

WN 21	Radiology as professions. Ethics. Peer review

WN 22	Directories (Table G) (Used for both monographs and serials)
WN 22.1	General coverage (Not Table G) (Used for both monographs and serials)
	Radiological laboratories, institutes, etc.
WN 23	Collective
WN 24	Individual (Cutter from name of institution)

WN 25	Laboratory manuals. Technique

[WN 26]	[This number not used]
	Classify works on equipment in WN 150; catalogs of equipment in W 26.

WN 26.5	Informatics. Automatic data processing. Computers (General)
	Classify works on use for special subjects by subject.
	Hospitals, clinics, etc.
WN 27	Collective (Table G)
WN 27.1	General coverage (Not Table G)
WN 28	Individual (Cutter from name of hospital) (Table G)
	Museums, exhibitions, etc.
WN 28.5	Collective
WN 28.6	Individual (Cutter from name of museum, etc.)

WN 32	Laws (Table G) (Used for both monographs and serials)
WN 32.1	General coverage (Not Table G) (Used for both monographs and serials)
WN 33	Discussion of law (Table G) (Used for both monographs and serials)
WN 33.1	General coverage (Not Table G) (Used for both monographs and serials)

WN 39	Handbooks. Resource guides (Used for both monographs and serials)

WN 100	General works. Stereoscopy. Electrokymography

WN 105	Ionizing radiation

WN 110	Health physics
	Include here works on the physics of radiation and nuclear medicine.

WN 150	Equipment and supplies
	Classify works on use of radiation counters, etc., in radiation protection in WN 650. Classify catalogs in W 26.

WN 160	Technology. Contrast media (General or not elsewhere classified) (e.g., Positioning)
	Classify works on laboratory techniques in WN 25.
	Diagnostic Imaging. Radiography
	Classify works on diagnosis of a system, region or organ with the specific area.

WN 180	Diagnostic imaging (General or not elsewhere classified)

WN 185	Magnetic resonance imaging

WN 200	Radiography (General or not elsewhere classified)

WN 203	Radionuclide imaging

WN 205	Thermography

WN 206	Tomography

WN 208	Ultrasonography

WN 210	Foreign body localization

WN 220	Fluoroscopy

WN 230	Dental diagnostic imaging (General or not elsewhere classified)

WN 240	Pediatric diagnostic imaging
	Radiotherapy

WN 250	General works
WN 250.5	Special types, A-Z
WN 250.5.B7	Brachytherapy
WN 250.5.R2	Radiotherapy, Computer-assisted
WN 250.5.R3	Radiotherapy, High-energy
WN 250.5.X7	X-ray therapy

WN 250.6	Radiotherapy dosage
	Radium

WN 300	General works

WN 340	Therapeutic use (e.g., Use of radon seeds, radium needles, etc.)
	Radioactivity (Excluding Roentgen Rays and Radium)
	Classify here works on specific elements as well as general works. Classify works on medical applications for a specific disease or organ with the disease or organ. General Radioactivity

WN 415	Biological aspects of nuclear medicine, atomic energy, and radioisotopes (General)
	Classify works dealing with physical aspects in QC.

WN 420	Radioisotopes. Radioactive elements
	Classify works on medical applications in WN 440-450.
	Nuclear Medicine

WN 440	Nuclear medicine
WN 445	Diagnosis
	Classify works on radionuclide imaging in WN 203.
WN 450	Therapeutics
	Radiation Effects. Radiation Protection

WN 600	Radiobiology. Radiologic health
	Classify here works on general effects of radiation to man, animals, and plant life.

WN 610	Radiation injuries
	Classify general works on radiation-induced abnormalities in QS 681.
WN 612	Food contamination
WN 615	Radioactive pollution and pollutants (General)
	Classify works on non-radioactive pollution in WA 754 for general air pollution; in WA 450 for industrial air pollution; in WA 785 for soil pollution; and WA 689 for water pollution.
WN 620	Injurious effects on man and animals
WN 630	Injurious effects on plant life (related to human ecology)

WN 650	Radiation protection
	Cf. WA 788 Industrial wastes.
	Radiometry

WN 660	Radiometry

WN 665	Radiation dosage