Access Online Databases
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Select Library of Congress Classification Web from the list.
At the Main Menu, select your search
Browse Classification Schedules
Use these schedules if you already know the Call Number and would like to know the subject associated with it. Enter the Call Number and press Go.Classification Search
Search classifications. Use Keyword unless you know the exact term or number. Search by Caption for the lowest portion of the hierarchy.
For example: For the classification number, QE349.H3, the caption is Hawaii. The full hierarchy is Geology--Geographical divisions--Pacific islands, A-Z--Hawaii.
Search by Index Term for cross-references that will point you to the preferred term for the subject heading.
Headings include "used for" references (UF), "see also" (SA) and broader terms (BT), narrower terms (NT), and related terms (RT). NA is used for "not applicable".
From the Class Web Main Menu screen, click on Subject Headings.
Use the Unstructured subject heading or Keyword field unless you know the exact structure of the LC subject heading. Hits are sorted alphabetically. This means that phrase headings are interfiled with headings that are constructed with subfields.
The Keyword field allows you to search for terms anywhere within subject heading strings, rather than just the initial word or words of headings.
Use the subject correlations feature to find subject headings used with a call number or vice versa. From the Main Menu click LC Subject Heading & LC Classification Number Correlations to open the Subject Correlations window:
Type the LC classification number in the field and click Find to retrieve the list of subject headings associated with that number.
Type a subject heading in the Subject heading search field. Class Web returns a browse list of subject heading strings that begin with that particular word.
LC Subject Heading and Dewey Decimal Classification Correlations
Enter a Dewey Decimal classification number, click Find and display a list of corresponding Library of Congress subject headings or input a Library of Congress subject heading and display a list of corresponding Dewey Decimal classification numbers.
LC Classification & Dewey Decimal Classification Correlations
Enter a Library of Congress classification number, click Find and display a list of corresponding Dewey Decimal classification numbers, or vice versa. This can help you search the public library and the academic library for the same topic.
Clicking on the classification numbers in the results screen will give you the classification schedule where you can look at the record and the hierarchy.Hierarchy Browser
The hierarchy browser gives you an overview of an entire classification schedule hierarchy from general to specific. Clicking on links displays more specific breakdowns of each schedule.
From the Main Menu, click on Hierarchy Classification Browser. In the LC Class # box, enter a Call Number and click Go. Class Web displays the class at the highest level of the hierarchy, showing each of the major subclasses. Clicking on each link allows you to search more specific hierarchy.Search Results
Online help is available at the top of each page or at the bottom of the Main Menu screen.
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