A GENERAL WORKS
AC Collections. Series. Collected works
AE Encyclopedias
AG Dictionaries and other general reference works
AI Indexes
AM Museums. Collectors and collecting
AN Newspapers
AP Periodicals
AS Academies and learned societies
AY Yearbooks. Almanacs. Directories
AZ History of scholarship and learning. The humanities
B Philosophy (General)
BC Logic
BD Speculative philosophy
BF Psychology, Parapsychology, Occult sciences
BH Aesthetics
BJ Ethics
BJ Social usages. Etiquette
BL Religions. Mythology. Rationalism
BM Judaism
BP Islam. Bahai Faith. Theosophy, etc.
BQ Buddhism
BR Christianity
BS The Bible
BT Doctrinal Theology
BV Practical Theology
BX Christian Denominations
C Auxiliary Sciences of History (General)
CB History of Civilization
CC Archaeology
CD Diplomatics. Archives. Seals
CE Technical Chronology. Calendar
CJ Numismatics
CN Inscriptions. Epigraphy
CR Heraldry
CS Genealogy
CT Biography
D History (General)
DA History of Great Britain
DAW History of Central Europe
DB History of Austria. Liechtenstein. Hungary. Czechoslovakia
DC History of France
DD History of Germany
DE History of the Greco-Roman world
DF History of Greece
DG History of Italy
DH History of Low Countries. Benelux Countries
DJ History of Netherlands (Holland)
DJK History of Eastern Europe (General)
DK History of Russia. Soviet Union. Former Soviet Republics
DK History of Poland
DL History of Northern Europe. Scandinavia
DP History of Spain
DP History of Portugal
DQ History of Switzerland
DR History of Balkan Peninsula
DS History of Asia
DT History of Africa
DU History of Oceania (South Seas)
DX History of Gypsies
E History of America and United States
F History of America and United States
G Geography (General)
GA Mathematical geography. Cartography
GB Physical geography
GC Oceanography
GE Environmental sciences
GF Human ecology. Anthropogeography
GN Anthropology
GR Folklore
GT Manners and customs (General)
GV Recreation. Leisure
H Social sciences (General)
HA Statistics
HB Economic theory. Demography
HC Economic history and conditions
HD Industries. Land use. Labor
HE Transportation and communications
HF Commerce
HG Finance
HJ Public finance
HM Sociology (General)
HN Social history and conditions. Social problems.
HQ The Family. Marriage. Women
HS Societies: secret, benevolent, etc.
HT Communities. Classes. Races
HV Social pathology. Social and public welfare.
HX Socialism. Communism. Anarchism
J General legislative and executive papers
JC Political theory. The state. Theories of the state
JF Political institutions and public administration
JJ Political institutions and public administration
JK Political institutions and public administration
JL Political institutions and public administration
JN Political institutions and public administration (Europe)
JQ Political institutions and public administration (Asia,
JS Local government. Municipal government
JV Colonies and colonization. Emigration and
JX International law
JZ International relations
K Law in general. Comparative and uniform law. Jurisprudence
KB Religious law in general. Comparative religious law.
KBM Jewish law. Halakah
KBP Islamic law. Shar_æah. Fiqh
KBR History of canon law
KBU Law of the Roman Catholic Church. The Holy See
KD Law of the United Kingdom and Ireland
KDZ America. North America
KE Law of Canada
KF Law of the United States
KG Latin America
KH South America
KJ Europe
KZ Law of nations
KZA Law of the sea
KZD Space law. Law of outer space
L Education (General)
LA History of education
LB Theory and practice of education
LC Special aspects of education
LD Individual institutions
LE Individual institutions
LF Individual institutions
LG Individual institutions
LH College and school magazines and papers
LJ Student fraternities and societies, United States
LT Textbooks
M Music
N Visual arts
NA Architecture
NB Sculpture
NC Drawing. Design. Illustration
ND Painting
NE Print media
NK Decorative arts
NX Arts in general
P Philology. Linguistics
PA Classical philology
PB Modern languages. Celtic languages
PC Romance
PD Germanic
PE English
PF West Germanic
PG Slavic. Baltic. Albanian
PH Uralic. Basque
PJ Oriental philology and literature
PK Indo-Iranian philology and literature
PL Languages of Eastern Asia, Africa, Oceania
PM Hyperborean, Indian, and artificial languages
PN Literature (General)
PQ French, Italian, Spanish, Portuguese literature
PR English literature
PS American, Canadian literature
PT German, Dutch, Scandinavian literature
PZ Fiction and juvenile belles lettres
Q Science (General)
QA Mathematics
QB Astronomy
QC Physics
QD Chemistry
QE Geology
QH Natural history, Biology (General)
QK Botany
QL Zoology
QM Human anatomy
QP Physiology
QR Microbiology
R Medicine (General)
RA Public aspects of medicine
RB Pathology
RC Internal medicine
RD Surgery
RE Ophthalmology
RF Otorhinolaryngology
RG Gynecology and obstetrics
RJ Pediatrics
RK Dentistry
RL Dermatology
RM Therapeutics. Pharmacology
RS Pharmacy and materia medica
RT Nursing
RV Botanic, Thomsonian, and eclectic medicine
RX Homeopathy
RZ Other systems of medicine
S Agriculture (General)
SB Plant culture
SD Forestry
SF Animal culture
SH Aquaculture. Fisheries. Angling
SK Hunting sports
T Technology (General)
TA Engineering (General). Civil engineering (General)
TC Hydraulic engineering, Ocean engineering
TD Environmental technology. Sanitary engineering
TE Highway engineering. Roads and pavements
TF Railroad engineering and operation
TG Bridge engineering
TH Building construction
TJ Mechanical engineering and machinery
TK Electrical engineering. Electronics. Nuclear engineering
TL Motor vehicles. Aeronautics. Astronautics
TN Mining engineering. Metallurgy
TP Chemical technology
TR Photography
TS Manufactures
TT Handicrafts. Arts and crafts
TX Home economics
U Military science (General)
UA Armies: Organization, distribution, military situation
UB Military administration
UC Maintenance and transportation
UD Infantry
UE Cavalry. Armor
UF Artillery
UG Military engineering, Air warfare, Space warfare
UH Other services
V Naval science (General)
VA Navies: Organization, distribution, naval situation
VB Naval administration
VC Naval maintenance
VD Naval seamen
VE Marines
VF Naval ordnance
VG Minor services of navies
VK Navigation. Merchant marine
VM Naval architecture. Shipbuilding. Marine engineering
Z BIBLIOGRAPHY. LIBRARY SCIENCE.
ZA Information resources (General)