How We Organize Our Collections

Call Numbers

Library of Congress

Most call numbers for items in our collection are assigned using the Library of Congress Classification system, often abbreviated LC, which groups items by subject.

The first letter in the call number tells you the general subject of an item, which can be useful if you want to browse a subject of interest.

For the complete list of subjects and additional information about classification, visit the Library of Congress Classification Outline.

A—General works

A–AZ
General works such as encyclopedias, almanacs, indexes, directories, & other general reference books

B—Philosophy, psychology, religion

B–BD, BH, BJ
Philosophy
BF
Psychology
BL–BX
Religion

C—History (auxiliary sciences—archaeology, genealogy)

C–CT
Auxiliary sciences of history
CC
Archaeology
CS
Genealogy
CT
General biography

D—World history and history of Europe, Asia, Africa, Australia, New Zealand, etc.

D
History—general
DA
History—Great Britain
DB–DR
History—Europe
DS
History—Asia
DT
History—Africa
DU
History—Australia, Oceania

E—History (general United States)

E11–143
America
E151–909
United States

F—History (local U.S., Canada, Mexico, Central and South America)

F1–F975
History—U.S.—local
F1001–F1140
History—Canada
F1211–F3799
History—Mexico, Latin America

G—Geography, anthropology, recreation

G–GC
Geography; oceanography
GF–GT
Anthropology
GV
Sports; recreation

H—Social sciences (business, economics, sociology)

H–HA
Social sciences—general; statistics
HB–HJ
Economics; finance
HM–HX
Sociology

J—Political science

J
Political science
JF
Constitutional history
JK
U.S. federal & state
JS
Local government
JX
International law & relations

K—Law

K
Law
KF
U.S. law
KFN
New Hampshire law

L—Education

L
Education

M—Music and books on music

M
Music
ML
Literature of music
MT
Musical instruction & study

N—Fine arts

N
Arts
NA
Architecture
NK
Decorative arts

P—Language and literature

P
Philology; linguistics
PA
Classics
PB–PD
Modern european languages
PE
English language
PF–PK
German, Slavic, Oriental lang. & literature
PL–PM
Eastern Asian & African lang. & literature
PN
Literature—general
PQ
Romance literature
PR
English literature
PS
American literature
PT
Germanic literature

Q—Science

Q
Sciences—general
QA
Mathematics
QB
Astronomy
QC
Physics
QD
Chemistry
QE
Geology
QH–QR
Life sciences

R—Medicine

R
Medicine
RA
Public aspects of medicine
RC
Internal medicine
RM
Therapeutics; pharmacology
RT
Nursing

S—Agriculture

S
Agriculture
SB
Plant culture
SD
Forestry
SF
Animal culture
SH
Aquaculture; fisheries

T—Technology (engineering, photography, home economics)

T
Technology
TA
Engineering—general
TD
Environmental technology
TE
Highway engineering; roads
TH
Building construction
TJ
Mechanical engineering
TK
Electrical engineering
TP
Chemical engineering
TR
Photography
TX
Home economics (cooking)

U—Military science

U
Military science

V—Naval science

V
Naval science

Z—Bibliography, library science, information resources (general)

Z
Books; libraries; bibliography

U.S. Federal Depository Documents

Federal documents in our collection use a call number scheme called the SuDocs (Superintendent of Documents) system.

The call numbers on these documents represent the issuing agency and type of publication, not the subject. For example, PREX 2 represents the Office of Management & Budget, while PREX 3 includes publications from the Central Intelligence Agency.

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