Library of
Congress System
The PTC Library uses the Library of Congress Classification
System to organize most of its resources. Each item is labeled with a unique call number,
comprised of a series of letters and numbers, that indicates the book's proper place
on the library shelves.
Call numbers are primarily based on subject matter and can be very helpful to a
researcher who is trying to locate information on a certain topic. The
information below matches Library of Congress call number groups with the
subjects that they represent:
| A |
General
Works
AC |
Collections |
| AE |
Encyclopedias |
| AG |
Dictionaries |
| AI |
Indexes |
| AM |
Museums |
| AN |
Newspapers |
| AP |
Periodicals |
| AS |
Academies
& Learned
Societies |
| AY |
Yearbooks,
Almanacs, Directories |
| AZ |
History
of Scholarship, The
Humanities |
|
B |
Philosophy,
Psychology & Religion
B |
Philosophy (General) |
| BC |
Logic |
| BD |
Speculative
Philosophy |
| BF |
Psychology,
Parapsychology, Occult
Sciences |
| BH |
Aesthetics |
| BJ |
Ethics,
Social Usages,
Etiquette |
| BL |
Religion,
Mythology |
| BM |
Judaism |
| BP |
Islam,
Bahai Faith,
Theosophy, etc. |
| BQ |
Buddhism |
| BR |
Christianity,
Church History |
| BS |
Bible |
| BT |
Doctrinal
Theology |
| BV |
Practical
Theology |
| BX |
Christian
Denominations |
|
C |
Auxiliary
Sciences of History (General)
CB |
History of
Civilization |
| CC |
Archaeology |
| CD |
Diplomatics,
Archives, Seals |
| CE |
Technical
Chronology, Calendar |
| CI |
Numismatics |
| CN |
Inscriptions,
Epigraphy |
| CR |
Heraldry |
| CS |
Genealogy |
| CT |
Biography
(General) |
|
D |
History
(General) / Europe (General)
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
Countrie |
| 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 - F |
History:
America
E |
United States
(General) |
| F |
United
States Local History,
Canada, Latin America |
|
G |
Geography,
Anthropology & Recreation
G |
Geography (General),
Atlases, Globe, Maps |
| 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
H |
Social Sciences
(General) |
| HA |
Statistics |
| HB |
Economic
Theory, Demography |
| HC |
Economic
History and Conditions |
| HD |
Economic
History and Conditions |
| 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, Race |
| HV |
Social
Pathology, Social and
Public Welfare |
| HX |
Socialism,
Communism, Anarchism |
|
J |
Political
Science
J |
General Legislative
and Executive Papers |
| JA |
Political
Science (General) |
| JC |
Political
Theory |
| 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 |
| JZ |
International
Relations |
|
K |
Law
K |
General, Comparative
and Uniform Law,
Jurisprudence |
| 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-KK |
Europe |
| KL-KW |
Asia,
Africa, Pacific Area,
Antarctica |
| KZ |
Law
of Nations |
|
L |
Education
L |
Education (General) |
| 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
M |
Musical Works |
| ML |
Literature
on Music |
| MT |
Musical
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
& Literature
P |
Philology, Linguistics |
| PA |
Greek
and Latin Language 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
Literatures |
| PH |
Finno-Ugric,
Basque Languages and
Literatures |
| PJ |
Oriental
Languages and
Literatures (General),
Semitic Languages and
Literatures |
| 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
Literature |
| PZ |
Juvenile
Belles Lettres |
|
Q |
Science
Q |
Science (General) |
| QA |
Mathematics |
| QB |
Astronomy |
| QC |
Physics |
| QD |
Chemistry |
| QE |
Geology |
| QH |
Natural
History (General) |
| QH |
Biology
(General) |
| QK |
Botany |
| QL |
Zoology |
| QM |
Human
Astronomy |
| QP |
Physiology |
| QR |
Microbiology |
|
R |
Medicine
R |
Medicine (General) |
| 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 |
| RV |
Botanic,
Thomsonian, and
Eclectic Medicine |
| RX |
Homeopathy |
| RZ |
Other
Systems of Medicine |
|
S |
Agriculture
S |
Agriculture (General) |
| SB |
Plant
Culture |
| SD |
Forestry |
| SF |
Animal
Culture |
| SH |
Aquaculture,
Fisheries, Angling |
| SK |
Hunting
Sports |
|
T |
Technology
T |
Technology (General) |
| TA |
Engineering
(General), Civil
Engineering |
| TC |
Hydraulic
Engineering |
| TD |
Environmental
Engineering, 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
U |
Military Science
(General) |
| UA |
Armies:
Organization,
Distribution, Military
Situation |
| UB |
Military
Administration |
| UC |
Maintenance
and Transportation |
| UD |
Infantry |
| UE |
Cavalry,
Armor |
| UF |
Artillery |
| UG |
Military
Engineering, Air
Forces |
| UH |
Other
Services |
|
V |
Naval
Science
(for
Naval History, see D-F)
| | |
