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A - General Works
AC - Collections
AE - Encyclopedias
AG - Dictionaries
AI - Indexes
AM - Museums
AN - Newspapers
AP - Periodicals
AS - Academies and learned societies
AY - Yearbooks. Almanacs. Directories
AZ - History of scholarship. The humanities
B - Philosophy, Psychology, and Religion
BC - Logic
BD - Speculative philosophy
BF - Psychology
BH - Aesthetics
BJ - Ethics
BL - Religion. Mythology. Rationism
BM - Judaism
BP - Islam. Bahaism. Theosophy, etc.
BQ - Buddhism
BR - Christianity
BS - The Bible
BT - Practical theology
BV - Practical theology
BX - Christian denominations
C - History: Auxiliary sciences
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 (General)
D - History: General, and Regions Outside the Americas
DA - Great Britain
DAW - Central Europe
DB - Austria. Hungary. Czechoslovakia
DC - France
DD - Germany
DE - The Greco-Roman World
DF - Greece
DG - Italy
DH - Low Countries. Benelux Countries
DJ - Netherlands (Holland)
DJK - Eastern Europe (General)
DK - Russia. Soviet Union. Former Soviet Republics. Poland
DL - Northern Europe. Scandinavia
DP - Spain. Portugal
DQ - Switzerland
DR - Balkan Peninsula. Turkey
DS - Asia
DT - Africa
DU - Oceania (South Seas)
DX - Gypsies
E - History: United States (General)
F - History: United States (Regional), and the Americas
G - Geography, Anthropology, Folklore, Recreation
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
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. Social reform
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 - Political Science
JA - Political science (General)
JC - Political theory
JE - Juvenile
JF - Political institutions and public administration General
JK - Political institutions and public administration United States
JL - Political institutions and public administration Canada. Latin America
JN - Political institutions and public administration Europe
JQ - Political institutions and public administration Asia. Africa. Australia. Pacific area
JS - Local government. Municipal government
JV - Colonies and colonization. Emigration and immigration. International migration
JZ - International relations
K - Law
KBR - Canon Law and Law of the Roman Catholic Church;. The Holy See
KD - United Kingdom and Ireland
KDZ - America. North America
KE - Canada
KF - United States
KG - Latin America. Central America. West Indies
KH - South America
KJ - Europe
KK - Europe
KL - Asia. Africa. Pacific Area. Antarctica
KW - Asia. Africa. Pacific Area. Antarctica
KZ - Law of nations
L - Education
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. Oceania
LH - College and school magazines and papers
LJ - Student fraternities and societies, United States
LT - Textbooks
M - Music
ML - Literature on music
MO - Missouri Government Documents
MT - Musical instruction and study
N - Fine Arts
NA - Architecture
NB - Sculpture
NC - Drawing. Design. Illustration
ND - Painting
NE - Print media
NK - Decorative arts. Applied arts
NX - Arts in general
P - Language and literature
PA - Greek and Latin languages and literatures
PB - Modern languages (General). Celtic languages
PC - Romance languages
PD - Germanic languages (General). Scandinavian languages
PE - English language
PF - West Germanic languages
PG - Slavic, Baltic, Albanian languages and literature
PH - Uralic, Basque languages and literatures
PJ - Oriental philology and literature (General). Semitic languages and literature
PK - Indo-Iranian languages and literatures
PL - Languages and literatures of Eastern Asia, Africa, Oceania
PM - Hyperborean, Indian, and Artificial languages
PN - Literature (General)
PQ - French, Italian, Spanish and Portuguese literatures
PR - English literature
PS - American literature
PT - Germanic literatures
PZ - Fiction and Juvenile belles lettres
Q - Science
QA - Mathematics, Computer Science, Statistics
QB - Astronomy
QC - Physics
QD - Chemistry
QE - Geology
QH - Natural History. Biology
QK - Botany
QL - Zoology
QM - Human anatomy
QP - Microbiology
R - Medicine
RA - Public aspects of medicine
RB - Pathology
RC - Internal medicine
RD - Surgery
RE - Ophthalmology
REF - Reference books
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
SB - Plant culture
SD - Forestry
SF - Animal culture
SH - Aquaculture. Fisheries. Angling
SK - Hunting sports
T - Technology
TA - Engineering (General). Civil engineering
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. Hospitality industry
U - Military Science
UA - Armies: Organization, distribution, military situation
UB - Military administration
UC - Maintenance and transportation
UD - Infantry
UE - Cavalry. Armor
UF - Artillery
UG - Military engineering. Air Force
UH - Other services
V - Naval Science
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 and Library Science
ZA - Information resources (General)