B. Philosophy, Psychology, Religion
B - History & systems of philosophy
BC - Logic
BD - Speculative philosophy
BF - Psychology
BH - Aesthetics
BJ - Ethics
BL - Religions, mythology, rationalism
BM - Judaism
BP - Islam, Bahaism, Theosophy
BR - Christianity (General)
BS - The Bible
BT - Doctrinal theology
BV - Practical theology
BX - Denominations and sects

C. Auxiliary Sciences of History
CB - History of civilization & culture
CC - Archaeology (General)
CD - Diplomatics, archives, seals
CE - Chronology
CJ - Numismatics
CN - Epigraphy
CR - Heraldry
CS - Genealogy
CT - Biography (General)

D. History - General & Eastern
D - History (General)
DA - Great Britain
DB - Austria, Czechoslovakia, Hungary
DC - France
DD -  Germany
DE - Mediterranean, Greco-Roman world
DF - Greece
DG - Italy
DH - DJ: Netherlands, Belgium, Luxembourg
DK - Russia
DL - Northern Europe
DP - Spain, Portugal
DQ - Switzerland
DR - Eastern Europe; Turkey
DS - Asia
DS520-DS689: Southeast Asia
DT - Africa
DU - Oceania, Australia, New Zealand
DX - Gypsies

E & F. History - Western Hemisphere
E - America (General), United States
F1-F975 - United States local history
F1001-F1140 - Canada
F1201-F1392 - Mexico
F1401-F3799 - Central and South American, the Caribbean area

G. Geography, Anthropology, Recreation
5G - Atlases, Globes, Maps
GA - Mathematical geography, cartography
GB - Physical geography
GC - Oceanography
GF - Human ecology
GN - Anthropology
GR - Folklore
GT - Manners and customs
GV - Sports and recreation
GV1580-GV1799 - Dance

H. Social Sciences and Business
H - Social Sciences (General)
HA - Statistics
HB - Economic theory
HC - Economic history and conditions
HD - Land, agriculture, communication
HE - Transportation, communication
HF - Commerce
HG - Finance
HJ - Public finance
HM - Sociology
HN - Social history
HQ - Social groups; the family, marriage, women
HS - Societies and clubs
HV - Social pathology, criminology, welfare
HX - Socialism, communism, narchism

J. Political Science
J - Official documents
JA - Collections and general works
JC - Political theory
JF - Constitutional history and administration
JK - U.S. constitutional history
JS - Local government
JX - International law, international relations

K. Law
K - Law (General)
KD - Law of the United Kingdom and Ireland
KE - Law of Canada
KF - Law of the United States
KFN - Individual states
KG - Law of Latin America, Mexico, Central America (General)
KH - Law of South America (General)
KJ - Law of Europe

L. Education
L - Education (General)
LA - History of education
LB - Theory and practice
LC - Special aspects
LD - Individual U.S. institutions
LH - College and school publications
LJ - Student fraternities and societies
LT - Textbooks (General)

M. Music
M - Music (General)
ML - Literature of music
MT - Music 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
NX - Arts in general

P. Language and Literature
P - Linguistics
PA - Greek and Latin
PB - Modern European languages; Celtic languages
PC - Romance languages
PD - Old Germanic and Scandinavian languages
PE - English language
PF - Dutch, Flemish, German languages
PG - Slavic languages and literature
PJ - Middle Eastern languages and literature
PK - Indo-Iranian languages and literature
PL - East Asian, African, and Oceanic languages and literature
PM - American Indian; artificial languages
PN - Literature, literary history and collections
PN1993-PN1996 - Motion Pictures
PQ - Romance literature
PR - English literature
PS - American literature
PT - Germanic literature
PZ - Children's literature

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

R. Medicine
R - Medicine
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
RX - Homeopathy
RZ - Other systems of medicine

S. Agriculture
S - Agriculture (General)
SB - Plant culture
SD - Forestry
SF - Animal culture
SH - Aquaculture, fisheries, fishing
SK - Hunting

 

T. Technology
T - Technology (General)
TA - Engineering (General)
TC - Hydraulic engineering
TD - Environmental technology
TE - Railroad engineering
TG - Bridge engineering
TH - Building engineering
TJ - Mechanical engineering and machinery
TK - Electrical engineering; electronics
TL - Motor vehicles; aeronautics; astronautics
TN - Mining engineering; metallurgy
TP - Chemical technology
TR - Photography
TS - Manufactures
TT - Handicrafts; arts and crafts
TX - Home economics; cooking

U. Military Service
UA - Armies
UB - Military administration
UC - Maintenance and transportation
UD - Infantry
UE - Calvary; armored and mechanized Calvary
UF - Artillery
UG - Military engineering
UH - Other services

V. Naval Science
VA - Navies
VB - Naval administration
VC - Naval maintenance
VD - Naval seamen
VE - Marines
VF - Naval ordinance
VG - Minor services of navies
VK - Navigation. Merchant marine
VM - Naval architecture. Shipbuilding. Marine engineering.

Z. Library Science