Library of Congress

Main sections

This system is often favoured by academic libraries

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. PSYCHOLOGY. RELIGION  
 
B   Philosophy (general)  
BC   Logic  
BD   Speculative philosophy  
BF   Psychology  
BH   Aesthetics  
BJ   Ethics  
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  
 
C   AUXILIARY SCIENCES OF HISTORY  
 
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 and Old World  
 
D   History (general)  
DA   Great Britain  
DAW   Central Europe  
DB   Austria. Liechtenstein. Hungary. Czechoslovakia DC France. Andorra. Monaco  
DD   Germany  
DE   The Mediterranean Region. The Greco-Roman World  
DF   Greece  
DG   Italy. Malta  
DH   Netherlands (Low Countries)  
DJ   Netherlands (Holland)  
DJK   Eastern Europe  
DK   Russia. Soviet Union. Former Soviet Republics. Poland  
DL   Northern Europe. Scandinavia  
DP   Spain. Portugal  
DQ   Switzerland  
DR   Balkan Peninsula  
DS   History of Asia  
DT   History of Africa  
DU   History of Oceania (South Seas)  
DX   History of Gypsies  
 
E   HISTORY: AMERICA  
 
E11   America  
E151   United States  
 
F   HISTORY: AMERICA  
 
F1   United States local history  
F1001   British America. Canada Dutch America  
F1170   French America  
F1201   Latin America. Spanish America  
 
G   GEOGRAPHY. ANTHROPOLOGY. RECREATION  
 
G   Geography (general). Atlases. Maps  
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  
 
H   Social sciences (general)  
HA   Statistics  
HB   Economic theory. Demography  
HC   Economic history and conditions  
HD   Economic history and conditions  
HE   Transportation and communications  
HF   Commerce  
HG   Finance  
HJ   Public finance  
HM   Sociology (general)  
HN   Social history and conditions. Social problems. Social reform  
HQ   The family. Marriage. Women  
HS   Societies: secret, benevolent, etc.  
HT   Communities. Classes. Races  
HV   Social pathology. Social and public welfare. Criminology  
HX   Socialism. Communism. Anarchism  
 
J   POLITICAL SCIENCE  
 
J   general legislative and executive papers  
JA   Political science (general)  
JC   Political theory  
JF   Political institutions and public administration  
JK   Political institutions and public administration (United States)  
JL   Political institutions and public administration (other Americas)  
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 immigration. International migration  
JX   International law  
JZ   International relations  
 
K   LAW  
 
K   Law (general). Comparative and uniform law. Jurisprudence  
KD   Law of the United Kingdom and Ireland  
KE   Law of Canada  
KF   Law of the United States  
KG   Latin America (general)  
KH   South America (general)  
KJ   Europe  
KL   History of law. The ancient orient  
KLA   Eurasia  
KM   Asia  
KQ   Africa  
KU   Pacific Area  
KWX   Antarctica  
KZ   Law of nations  
KZA   Law of the sea  
KZD   Space law. Law of outer space  
 
L   EDUCATION  
 
L   Education (general)  
LA   History of education  
LB   Theory and practice of education  
LC   Special aspects of education  
LD   Individual institutions (United States)  
LE   Individual institutions. America (except United States)  
LF   Individual institutions (Europe)  
LG   Individual institutions (Asia, Africa, Indian Ocean islands, Australia, New Zealand, Pacific islands)  
LH   College and school magazines and papers  
LJ   Student fraternities and societies, United States  
LT   Textbooks  
 
M   MUSIC AND BOOKS ON MUSIC  
 
M   Music (general)  
ML   Literature on music  
MT   Musical instruction and study  
 
N   FINE ARTS  
 
N   Visual arts (general)  
NA   Architecture  
NB   Sculpture  
NC   Drawing. Design. Illustration  
ND   Painting  
NE   Print media  
NK   Decorative arts. Applied arts. Decoration and ornament  
NX   Arts in general  
 
P   LANGUAGE AND LITERATURE  
 
P   Philology. Linguistics  
PA   Classical philology. Greek philology and language. Medieval and modern Greek language. Latin philology and language. Classical literature. Greek literature. Byzantine and modern Greek literature. Roman literature. Medieval and modern Latin literature  
PB   Modern European languages  
PC   Romance languages  
PD   Germanic languages  
PE   English  
PF   West Germanic  
PG   Slavic. Baltic, Albanian languages and literature  
PH   Finno-Ugrian, Basque languages and literatures  
PJ   Oriental languages and literatures  
PK   Indo-Iranian PL Languages and literatures of Eastern Asia, Africa, Oceania PM Hyperborean, Indian, and Artificial languages  
PN   Literature (general)  
PQ   French literature. Italian literature. Spanish literature. Portuguese literature  
PR   English literature  
PS   American literature  
PT   Germanic literatures  
PZ   Fiction and juvenile belles lettres  
 
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  
 
R   MEDICINE  
 
R   Medicine (general)  
RA   Public aspects of medicine  
RB   Pathology  
RC   Internal medicine  
RD   Surgery  
RE   Ophthalmology  
RF   Otorhinolaryngology  
RG   Gynecology and obstetrics  
RJ   Paediatrics  
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  
 
S   Agriculture (general)  
SB   Plant culture  
SD   Forestry  
SF   Animal culture  
SH   Aquaculture. Fisheries. Angling  
SK   Hunting sports  
 
T   TECHNOLOGY  
 
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  
 
U   Military science (general)  
UA   Armies: Organization, distribution, military situation  
UB   Military administration  
UC   Maintenance and transportation  
UD   Infantry  
UE   Cavalry. Armour  
UF   Artillery  
UG   Military engineering. Air forces. Air warfare. Military astronautics. Space warfare. Space surveillance  
UH   Other services  
 
V   NAVAL SCIENCE  
 
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   LIBRARY SCIENCE  
 
Z   Books (general). Writing. Paleography. Book industries and trade. Libraries. Bibliography  
ZA   Information resources (general)