What is Library of Congress and how does it work? How do you locate materials?
Library catalogs provide users with the call numbers for library materials. Call numbers are the specific numbers and letters dedicated to each title in the library. Most, but not all, university libraries use the Library of Congress classification system to catalog their materials.
The Library of Congress system of classification is an alphabetical and
numerical system that uses decimals to extend categories. Each letter
signifies a certain subject area. For instance, PS is American literature,
PT is German literature, R is medicine, etc. To see the schedule for classifying
materials visit the Library of Congress Website at: http://lcweb.loc.gov/catdir/cpso/lcco/lcco.html.
To locate call numbers in the library go to our LC Location page.
There are many advantages to using LC. One advantage is that a subject can be refined infinitely because the system uses decimals; the longer the number, the more specific the subject heading. Another advantage is, that since LC subject headings are controlled, one can go from library to library and anticipate the subject location of books and journals (BF is psychology in every library); and, usually, books and journals will have the same call number in every library that uses Library of Congress.
One disadvantage is that since the system uses a controlled language, it sometimes seems arbitrary and unnatural. For instance, Library of Congress uses "doping in sports" as the subject heading for "drugs and sports." This can lead to much frustration and confusion among library users. If you have difficulty finding materials on your topic, consult with the librarians.
To locate items:
It is also imperative to understand how to read the numbers to locate items in the library. Since LC is a decimal system every number becomes a decimal after a decimal appears. For instance the following numbers are in correct order:
PN233 .R234
Test yourself!
Which item would be first on the shelves?
Which item would be last on the shelves?
Do you need some help with this? Contact Sharon Elteto: eltetos@pdx.edu
Page developed and maintained by:Sharon Elteto
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eltetos@pdx.edu