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Library of Congress Classification System

What the letters Represent

Use this table to decipher the two- and three-letter codes that call numbers in the Library of Congress classification system begin with.

Library of Congress Main Classes
Click a letter to jump to see more details
A General Works
B Philosophy, Psychology, Religion
C Auxiliary Sciences of History
D History, General and old World
E-F History, America
G Geography, Anthropology, Recreation
H Social Sciences
J Political Science
K Law
L Education
M Music and Books on Music
N Fine Arts
P Language and Literature
Q Science
R Medicine
S Agriculture
T Technology
U Military Science
V Naval Science
Z Bibliography. Library Science

 

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A: GENERAL WORKS
AC Collections. Series. Collected works
AC Collections. Series. Collected works
AE Encyclopedias (General)
AG Dictionaries; general reference books
AI Indexes (General)
AM Museums
AN Newspapers
AP Periodicals (General)
AS Academics and learned societies (General)
AY Yearbooks. Almanacs. Directories
AZ History of scholarship and learning. The humanities; Popular errors, delusions, superstitutions

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B: Philosophy, Psychology, Religion
B Philosophy (General)
BC Logic
BD Speculative Philosophy
BF Psychology
BH Aesthetics
BJ Ethics. Social Usages. Etiquette
BL Religions. Mythology. Rationalism
BM Judaism
BP Islam. Bahaism. Theosophy, etc.
BQ Buddhism
BR Christianity
BS The Bible
BT Doctrinal theology
BV Practical theology
BX Christian denominations

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C: Auxiliary Sciences of History
C Auxiliary sciences of history (General)
CB History of civilization
CC Archaeology (General)
CD Diplomatics. Archives. Seals
CE Technical chronology. Calendar
CJ Numismatics
CN Inscriptions. Epigraphy
CR Heraldry
CS Genealogy
CT Biography

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D: History: General and Old World
D History (General)
DA Great Britain
DB Austria. Liechtenstein. Hungary. Czechoslovakia
DC France. Andorra. Monaco
DD Germany
DE The Mediterranean. Greco-Roman World
DF Greece
DG Italy
DH Netherlands (Holland)
DJK Eastern Europe
DK Soviet Union
DL Northern Europs. Scandinavia
DP Spain. Portugal
DQ Switzerland
DR Balkan Peninsula
DS Asia
DT Africa
DU Oceania (South Seas)
DX Gypsies

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E - F History: America
E 11-29 America (General)
E 31-46 North America
E 51-99 Indians. Indians of North America
E 101-135 Discovery of North America. Early Explorations
E 151 United States (General)
E 184-185.98 Elements in the population
E 184.5-185.98 African-Americans
E 186-199 Colonial History
E 201-298 Revolution
E 301-453 Revolution to the Civil War
E 351-364.9 War of 1812
E 401-415.2 War with Mexico
E 441-453 Slavery
E 456-655 Civil War
E 482-489 Confederate States of America
E 600-738 Late nineteenth century
E 714-735 Spanish-American War
E 740- Twentieth Century
F 1-975 United States local history
F 1001-1140 British America. Canada
F 1202-2191 Mexico. Latin America. Central America. West Indies
F 2201-3799 South America

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G: Geography (General) Atlases, Maps
GA Mathematical geography. Cartography
GB Physical geography
GC Oceanography
GF Human Ecology. Anthropogeography
GN Anthropology
GR Folklore
GT Manners and customs (General)
GV Recreation. Leisure

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H: Social Sciences
H Social Sciences (General)
HA Statistics
HB Economic Theory. Demography
HC Economic history and conditions
HD Industries. Land Use. Labor
HE Transportation and communication
HF Commerce
HG Finance
HJ Public Finance
HM Sociology (general and theoretical)
HN Social history/problems/reform
HQ The family. Marriage. Women
HS Societies: secret, benevolent, etc. Clubs
HT Communities. Classes. Races
HV Social pathology/public welfare. Criminology
HX Socialism. Communism. Anarchism

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J: Political Science
J General legislative and executive papers
JA Collections and general works
JC Political theory
JF General works
JK United States
JL British America. Latin America
JN Europe
JQ Asia. Africa. Australia. Oceania
JS Local government
JV Colonies and colonization. Emigration and immigration
JX Interntional law. International relations

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K: Law
K 1-7720 Law (General)
KDZ 0-4999 America. North America
KF Hazardous waste regulation

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L: Education
L Education (General)
LA History of Education
LB Theory and Practice of Education
(LB 1140-1602: Early Childhood Education)
LC Special Aspects of Education
LD Schools: United States
LE Schools: America, except United States
LF Schools: Europe
LG Schools: Asia. Africa. Oceania
LH College and school magazines and papers
LJ Student fraternities and societies, U.S.
LT Textbooks

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M: Music and Books on Music
M Music (General)
ML Literature of Music
MT Musical instruction and study

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N: Fine Arts
N Visual Arts
NA Architecture
NB Sculpture
NC Drawing. Design. Illustration
ND Painting
NE Print media
NK Decorative and applied arts. Decoration and ornament
NX Arts in general

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P: Language and Literature
P Philology and linguistics (General)
PA Classical languages and literatures
PB Modern European languages
PC Romance languages
PD Germanic languages
PE English
PF-PM Other languages
PN Literature
PQ Romance literatures
PR English literature
PS American literature
PT Germanic literature
PZ Juvenile literature

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Q: Science
Q Science (General)
QA Mathematics
QB Astronomy
QC Physics
QD Chemistry
QE Geology
QH Natural History (General) Biology (General)
QK Botany
QL Zoology
QM Human anatomy
QP Physiology
QR Microbiology

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R: Medicine
R Medicine (General)
RA Public Aspects of Medicine
RB Pathology
RC Internal medicine
RD Surgery
RE Opthamology
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

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S: Agriculture
S Agriculture (General)
SB Plant culture
(317.5-450.87: Horticulture)
SD Forestry
SF Animal Culture
SH Aquaculture. Fisheries. Angling
SK Hunting

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T: Technology
T Technology (General)
TA Engineering (General). Civil engineering (General)
TC Hydraulic 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 Manufacturers
TT Handicrafts. Arts and crafts
TX Home economics
(TD341-840: Nutrition through Cookery)

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U: Military Science
U Military Science (General)
UA Armies: Organization, description, facilities, etc.
UB Military adminiatration
UC Maintenance and transportation
UD Infantry
UE Cavalry. Armored and mechanized cavalry
UF Artillery
UG Military engineering. Air forces. Air warfare
UH Other services

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V: Naval Science
V Naval Science (General)
VA Navies: Organization, description, facilities. etc.
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
(VM975-989: Diving)

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Z: Library Science
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