A - COLLECTIONS. SERIES

AC           Collections. Series

AG           Dictionaries and other general references works

AY           Yearbooks, Almanacs, Directories

B - PHILOSOPHY, PSYCHOLOGY, RELIGION

B Philosophy

BC Logic

BD Speculative philosophy

BF Psychology

BH Aesthetics

BJ Ethics

BL Religion

BM Judaism

BP Islam

BQ Buddhism

BR Christianity

BS The Bible

BT Doctrinal Theology

BV Practical Theology

BX Christian Denominations

C - AUXILIARY SCIENCE OF HISTORY

CB           History of Civilization

CC            Archaeology

CD           Diplomacy, Archives

CJ             Numismatics, Coins

D - HISTORY: WORLD HISTORY AND HISTORY OF EUROPE, ASIA, AFRICA, OCEANIA, ETC.

D              General History

DA           Great Britain

DB           Austria, Hungary, Liechtenstein, Czechoslovakia, Slovakia

DC           France

DD           Germany

DE           Greco-Roman World

DF           Greece

DG           Italy

DH          Low Countries: Belgium, Luxembourg

DJ             Netherlands: Holland

DK           Russia, Soviet Union

DL           Northern Europe, Scandinavia

DP           Spain, Portugal

DR           Balkan Peninsula

DS            Asia

DT           Africa

DU           Oceania, Australia, New Zealand

DX           Romany

E - HISTORY: AMERICA – U.S.A.

E               America

G - GEOGRAPHY. ANTHROPOLOGY

G              General. Atlases, Maps

GA           Mathematics, Geography, Cartography

GB           Physical geography

GC           Oceanography

GF           Ecology

GN           Anthropology

GR           Folklore

GT           Manners and Customs

GV           Recreation, Leisure, Sports, Games

H - SOCIAL SCIENCES

HA Statistics

HB Economics

HC Economic History

HD Land, Agriculture, Industry

HE Transportation and Communication

HF Commerce

HG Finance

HJ Public Finance

HM Sociology (General)

HN Social History. Social Problems

HQ Family

HS Societies, Clubs

HT Communities. Classes. Races

HV Social pathology

HX Socialism, Communism, Anarchism

J - POLITICAL SCIENCE

JA Political science (General)

JC Polítical theory

JF Political institutions and public administration

JK Political Institutions and public administration (United States)

JL Political Institutions and public administration (Canada, Latino America)

JN Political institutions and public administration (Europe)

JS Local government. Municipal government

JV Colonies and colonization. Emigration and immigration

JX International Law

JZ International relations

K - LAW

K              General

KD           United Kingdom and Ireland

KE           Canada

KF           United States

L - EDUCATION

LA           History of education

LB           Theory and practice of education

LC            Special aspects of education

LF            Individual Institutions: Europe

M - MUSIC

M             Music

ML          Literature on Music

MT          Instruction and studies

N - FINE ARTS

N              Visual Arts (General)

ND           Painting

NX           Arts in general

P - LANGUAGE AND LITERATURE

PA Classical philology

PC Romance languages

PE English languages

PG Slavic. Baltic. Albanian languages

PJ Oriental philology and literature

PL Languages of Eastern Asia, Africa, Oceania

PM Hyperborean, Indian, and artificial languages

PN Literature (General)

PQ French, Italian, Spanish and Portuguese literature

PR English literature

PS American Literature

PT German Literature

PZ Fiction and juvenile belle lettres

Q - SCIENCE

QA           Mathematics

QB           Astronomy

QC           Physics

QD           Chemistry

QE           Geology

QH          Natural history. Biology

QK           Botany

QL           Zoology

QP           Physiology

QR           Microbiology