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LIBRARY OF CONGRESS CLASSIFICATION SYSTEM
The books in this library are arranged on the shelves according to the Library of Congress Classification System, which separates all knowledge into 21 classes, as outlined below. Each class is identified by a letter of the alphabet, subclasses by combinations of letters, and subtopics within classes and subclasses by a numerical notation.
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Classes
 
Classes
 
A General Works P Language and Literature
  (General encyclopedias, reference books, periodicals, etc.)  
P
Philology and linguistics
       
PA
Classical languages and literatures
B Philosophy-Religion  
PC
Romance languages
 
B-BJ
Philosophy, including BF, Psychology  
PD-PF
Germanic languages, including PE, En
 
BL-BX
Religion  
PG
Slavic languages and literatures
       
PJ-PL
Oriental languages and literatures
C Auxiliary Sciences of History  
PN
General and comparative literature
 
CB
History of civilization (General)  
PQ
Romance literatures
 
CC
Archeology  
PR
English literature
 
CD
Archives  
PS
American literature
 
CJ
Numismatics  
PT
Germanic literatures
 
CR
Heraldry  
PZ
Fiction in English, Juvenile literature
 
CS
Genealogy      
 
CT
Biography General) Q Science
       
QA
Mathematics
D History: General and Old World  
QB
Astronomy
 
(including geography of individual countries)
 
QC
Physics
 
D
World history including World Wars  
QD
Chemistry
 
DA
Great Britain  
QE
Geology
 
DB
Austria  
QH
Geology
 
DC
France  
QK
Natural history
 
DD, etc.
Other individual countries  
QL
Botany
       
QM
Zoology
E-F History of America  
QP
Human anatomy
  (including geography of individual countries)  
QR
Bacteriology
 
E 1-143
America (General)      
 
E151-857
United States (General) R Medicine
 
F 1-957
United States: States and local      
 
F 1001- 1140
Canada S Agriculture
 
f 120,etc.
Other individual countries  
SB
Plant culture and horticulture
       
SD
Forestry
G Geography, Anthropology, Folklore, etc.  
SF
Animal culture
 
G
Geography (General)  
SH
Fish culture and fisheries
 
GB
Physical geography  
SK
Hunting sport
 
GC
Oceanography      
 
GN
Anthropology T Technology
 
GR
Folklore   TA General engineering, including general civil engineering
 
GV
Recreation   TC Hydraulic engineering
        TD Sanitary and municipal engineering
H Social Sciences   TE Highway engineering
 
HA
Statistics   TF Railroad engineering
 
HB-HJ
Economics   TG Bridge construction
 
HM-HX
Sociology   TH Building construction
        TJ Mechanical engineering
J Political Science   TK Electrical engineering. Nuclear engineering.
 
JA-JC
Political science   TL Motor vehicles. Aeronautics. Astronautics.
 
JF-JQ
Constitutional history and public administration   TN Mining engineering. Mineral industries. Metallurgy
 
JS
Local government   TP Chemical technology
 
JX
International law   TR Photography
        TS Manufactures
K Law   TT Handicrafts. Arts and crafts
        TX Home economics
L Education      
      U Military Science
M Music      
 
ML
Literature of music V Naval Science
 
MT
Musical instruction      
      Z Bibliography and Library Science
N Fine Arts
 
NA
Architecture To locate BIOGRAPHIES
Lives of individuals, illustrative of any subject, are normally classified with that subject, e.g., Albert Einstein is classified in QC16.E5. Otherwise, they are classified with general biography in CT.
 
NB
Sculpture
 
NC
Graphic arts
 
ND
Painting
 
NK
Decorative arts
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The complete Library of Congress call number for any book may be found by consulting the Library Catalog.
A Librarian Will be Happy to Assist You if You are Unable to Find the Book You Want
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Copyright (C) 2004 Santa Rosa Junior College. All rights reserved. By:  Santa Rosa Junior College Librarians.
Last updated:April 24, 2008 Questions and Comments:  Phyllis Usina